1. Some extremal problems in approximation theory, Supervisor: Dr. Fahreddin Abdullayev, Mersin University, Graduate School of Natural and Applied Sciences, Mathematics Department, Mersin, Turkey, 2008.

1. Some properties of orthogonal polynomials over the area, Supervisor: Dr. Fahreddin Abdullayev, Mersin University, Graduate School of Natural and Applied Sciences, Mathematics Department, Mersin, Turkey, 2004.

2018
6. Deger, U.; Bayindir, H. APPROXIMATION BY NORLUND AND RIESZ TYPE DEFERRED CESARO MEANS IN THE SPACE H-P((omega)). MISKOLC MATHEMATICAL NOTES, 2018, 19, 823-833. 1000 + 0

https://dx.doi.org/10.18514/MMN.2018.2233

5. DEĞER, U.; Bayındır, H. . MISKOLC MATHEMATICAL NOTES, 2018, 19, 823-833. 1000 + 0

2016
4. Deger, U. A Note on the Degree of Approximation by Matrix Means in the Generalized Holder Metric. UKRAINIAN MATHEMATICAL JOURNAL, 2016, 68, 545-556. 1000 + 0

https://dx.doi.org/10.1007/s11253-016-1240-3

2015
3. Deger, U.; Kucukaslan, M. A generalization of deferred Cesaro means and some of their applications. JOURNAL OF INEQUALITIES AND APPLICATIONS, 2015, 1-16. 1000 + 0

https://dx.doi.org/10.1186/s13660-014-0532-0

2014
2. Kucukaslan, M.; Deger, U.; Dovgoshey, O. On the Statistical Convergence of Metric-Valued Sequences. UKRAINIAN MATHEMATICAL JOURNAL, 2014, 66, 796-805. 1000 + 12

https://dx.doi.org/10.1007/s11253-014-0974-z

2009
1. Abdullayev, F.; Deger, U. On the orthogonal polynomials with weight having singularities on the boundary of regions in the complex plane. BULLETIN OF THE BELGIAN MATHEMATICAL SOCIETY-SIMON STEVIN, 2009, 16, 235-250. 1000 + 22

Times Cited: 2

2018
6. Gölbol, S.; Esi, A.; Değer, U. On some double sequence spaces of interval number. PROYECCIONES JOURNAL OF MATHEMATICS, 2018, 37, 535-546. 200 + 0

http://http://www.revistaproyecciones.cl/article/view/3169

2016
5. Değer, U. On approximation to functions in the $W(L^{p}, \xi(t))$ class by a new matrix mean. NOVI SAD JOURNAL OF MATHEMATICS, 2016, 46, 1-14. 200 + 0

2015
4. Değer, U.; Kaya, M. On the approximation by Cesaro submethod. PALESTINE JOURNAL OF MATHEMATICS, 2015, 4 , 44-56. 200 + 0

http://pjm.ppu.edu/

2012
3. Küçükaslan, M.; Değer, U. On statistical boundedness of metric valued sequences. EUROPEAN JOURNAL OF PURE AND APPLIED MATHEMATICS, 2012, 5, 174-186. 200 + 6

2008
2. Değer, U. Approximation to functions from the Classes of $\overline{\psi}$- integrals by the Zygmund Sums. INTERNATIONAL JOURNAL OF CONTEMPORARY MATHEMATICAL SCIENCES, 2008, 3, 1499-1510. 200 + 0

2007
1. Değer, U. Approximation by Zygmund sums in the classes $C^{overline{\psi}}_{\infinity}$ . PROBLEMS OF THE THEORY OF APPROXIMATION OF FUNCTIONS AND RELATED QUESTIONS. COLLECTION OF PAPERS OF THE INSTITUTE OF MATHEMATICS OF NAS OF UKRAINE, 2007, T4, 92-107. 200 + 0

2018
7. DEĞER, U. . COMMUN.FAC.SCI.UNIV.ANK.SERIES A1, 2018, 67, 46-59. 300 + 0

6. Değer, U.; Bayındır, H. On the Degree of Approximation by theWoronoi-Norlund and Riesz Type Means in the GHM. AZERBAIJAN JOURNAL OF MATHEMATICS, 2018, 8, 00-00. 300 + 0

5. Uğur, D. On approximation by Nörlund and Riesz submethods in variable exponent lebesgue spaces. ANKARA UNIVERSITY, 2018, 67, 46-59. 0 + 0

http://dx.doi.org/10.1501/Commua1_0000000829

4. DEĞER, U.; Bayındır, H. . AZERBAIJAN JOURNAL OF MATHEMATICS, 2018, , -. 300 + 0

2017
3. Değer, U.; Bayındır, H. ON TRIGONOMETRIC APPROXIMATION BY DEFERRED-NORLUND PRODUCT MEANS IN LIPSCHITZ CLASS. JOURNAL OF MATHEMATICAL ANALYSIS, 2017, 8 , 70-78. 300 + 0

2016
2. Deger, U. On Approximation by Matrix Means of the Multiple Fourier Series in the Holder Metric. KYUNGPOOK MATHEMATICAL JOURNAL, 2016, 56, 57-68. 300 + 0

https://dx.doi.org/10.5666/KMJ.2016.56.1.57

2012
1. Deger, U.; Dagadur, I.; Kucukaslan, M. Approximation by trigonometric polynomials to functions in L_p-norm. PROCEEDINGS OF THE JANGJEON MATHEMATICAL SOCIETY, 2012, 15, 203-213. 300 + 8

2018
1. YASEMİN GÖLBOL, S.; ESİ, A.; DEĞER, U. . PROYECCIONES JOURNAL OF MATHEMATICS, 2018, 37, 535-546. 100 + 0

2008
1. Değer, U. A Note on Extremal Problem in Approximation by Zygmund Sums. CUMHURIYET UNIVERSITESI FEN BILIMLERI DERGISI, 2008, 29, 19-25. 100 + 0

23. Yasemin Gölbol, S.; Değer, U., The degree of approximation by generalized Zygmund sums in the classes C_{\infty}^{\overline{\psi}}. 5th International IFS and Contemporary Mathematics Conference, 2018-09-05, 2018-09-09, Kahramanmaraş, Turkey, 2018. 100

22. Yasemin Gölbol, S.; Değer, U., Approximation to Functions of the Classes ᴪ-integrals by Generalized Zygmund Sums. International Conference on Mathematics, 2018-07-03, 2018-07-06, İstanbul, Turkey, 2018. 100
http://raims.org/files/Abstract_Book_2018.pdf

21. DEĞER, U.; YÜKSEL, E., Approximation by the matrix submethods of double Fourier series in Lipschitz class. Mathematical Analysis, Differential Equation & Applications MADEA 8, 2018-06-17, 2018-06-23, Cholpon-Ata (Issyk-Kul), Kyrgyzstan, 2018. 100
https://fisfm.education/content/files/52/o3/52o3opoieqwybkcewlnchfqz2zlafc5v.pdf

20. Yüksel, E.; Değer, U., The degree of approximation by the submethods of double Fourier series in Lipschitz class. Second Internationational Mediterranean Science and Engineering Congress, 2017-10-25, 2017-12-27, Adana, Turkey, 2017. 100

19. Yasemin Gölbol, S.; Değer, U., $C_{\infty}^{\underline{\psi}}$ sınıflarında Nörlund ortalamaları ile yaklaşım. Second international Mediterranean Science and Engineering Congress, 2017-10-25, 2017-10-27, Adana, Turkey, 2017. 100

18. DEĞER, U.; BAYINDIR, H., Approximation by Deferred-Nörlund Product Means in Lp. IFSCOM2017, 2017-10-25, 2017-10-27, Mersin, Turkey, 2017. 100

17. Değer, U.; Yasemin Gölbol, S., $C_{\infty}^{\overline{\psi}}$ sınıflarında Riesz ortalamalarıyla yaklaşım. IFSCOM 2017, 2017-05-03, 2017-05-07, Mersin, Turkey, 2017. 100

16. Bayındır, H.; Değer, U., On trigonometric approximation by deferred-Nörlund (D.Np) means in Lip\alpha class. 2nd International Conference on Analysis and its Applications, 2016-07-12, 2016-07-15, Kırşehir, Turkey, 2016. 100

15. Yasemin Gölbol, S.; Değer, U.; Esi, A., Some Double Sequence Spaces of Interval Numbers. 2nd International Conference on Analysis and its Applications, 2016-07-12, 2016-07-15, Kırşehir, Turkey, 2016. 100

14. Bayındır, H.; Değer, U., On the degree of approximation by Cesaro submethod in the space H_{p}^{w}. Mathematical Analysis, Differential Equations and their Applications, 2015-09-08, 2015-09-13, Baku, Azerbaijan, 2015. 100

13. Değer, U., On Approximation by Matrix Means of the Multiple Fourier Series in the Hölder Metric. The Eight Congress of Romanian Mathematicians, 2015-06-26, 2015-07-01, Iasi, Romania, 2015. 100

12. Bayındır, H.; Değer, U., Approximation by generalized deferred Cesaro means in the space $H_{p}^{\omega}$. The Eight Congress of Romanian Mathematicians, 2015-06-26, 2015-07-01, Iasi, Romania, 2015. 100

11. Yasemin Gölbol, S.; Değer, U., On Some Spaces of Sequences of Interval Numbers. The Eight Congress of Romanian Mathematicians, 2015-06-26, 2015-07-01, Iasi, Romania, 2015. 100

10. Değer, U., On Approximation by Cesaro Submethods in Generalized Lebesgue Spaces Lp(x). V Annual Conference of the Georgian Mathematical Union, 2014-09-08, 2014-09-12, Batum, Georgia, 2014. 100

9. Bayındır, H.; Değer, U., Approximation by Cesaro Submethod in Generalized Hölder Metric. V Annual Conference of the Georgian Mathematical Union, 2014-09-08, 2014-09-12, Batum, Georgia, 2014. 100

8. Değer, U., On approximation by trigonometric polynomials to functions in generalized Hölder metric. International conference on "Mathematical Analysis, Differential Equations and their applications"(MADEA 2012), 2012-09-04, 2012-09-09, Mersin, Turkey, 2012. 100

7. Küçükaslan, M.; Değer, U.; Dovgoshey, O., On statistical convergence of metric valued sequences. International conference on "Mathematical Analysis, Differential Equations and their applications"(MADEA 2012), 2012-09-04, 2012-09-09, Mersin, Turkey, 2012. 100

6. Değer, U., On degree of approximation by Fourier series in generalized Hölder metric. International conference Theory of Approximation of Functions and its Applications dedicated to the 70th Anniversary of Corresponding Member of NAS of Ukraine, Professor A. I. STEPANETS(1942-2007), 2012-05-28, 2012-06-03, Kamianets-Podilski, Ukraine, 2012. 100

5. Değer, U.; Dağadur, İ.; Küçükaslan, M., On Approximation by Trigonometric Polynomials to Functions in L_{p} Norm. Int. Sci. Conf. Mathematical Analysis, Differential Equations and Their Applications, 2010-09-15, 2010-09-20, Sunny Beach, Bulgaria, 2010. 100

4. Değer, U., Approximation by Zygmund Sums in classes of $C_{\infty}^{\overline{\psi}}$. Int. Sci. Conf. II. Turkish World Mathematics Symposium, 2007-07-04, 2007-07-07, Sakarya, Turkey, 2007. 100

3. Değer, U., Approximation by Fejér Sums in classes of $C_{\infty}^{\overline{\psi}}$. Int. Sci. Conf."Mathematical Analysis, Differential Equations and Their Applications, 2006-09-18, 2006-09-23, Uzhgorod, Ukraine, 2006. 100

2. Abdullayev, F.; Değer, U., On Some Properties of Orthogonal Polynomials over an Area. International conference on mathematics and mechanics devoted to the 50-th anniversary from birthday of member of the correspondent of NASA, Proffesor I. T. Mamedov, 2005-05-11, 2005-05-13, Bakü, Azerbaijan, 2005. 100

1. Abdullayev, F.; Değer, U., Some properties of the orthogonal polynomials over area in domains of the complex plane. Int. Workshop "Analysis and its applications", 2004-09-07, 2004-09-11, Mersin, Turkey, 2004. 100

1. Değer, U., On approximation to functions in W(L^{p};\ksi(t)) class by matrix mean. Mathematical Analysis, Differential Equations and their Applications, 2015-09-08, 2015-09-13, Baku, Azerbaijan, 2015. 50

1. Değer, U.; Kaya, M., On trigonometric approximation by Cesaro submethod. XXVI. National Mathematical Symposium, 2013-09-04, 2013-09-07, Diyarbakır, Turkey, 2013. 50

1. DEĞER, U., 12. Sınıf Matematik . Taslak Ders Kitabı İnceleme Paneli , 2015-10-19, 2015-10-19, Ankara, Turkey, 2015. 25
http://meb.gov.tr

1. , , Project Number: , 3860 USD, Researcher, 2018,Completed. 0

2. Determination of the approximation properties in some classes of y-integrals, BAP, Project Number: 2017-1-TP3-2251, 7000 TL, Manager, 2019,Completed. 100

1. Determination of the degree of approximation by the submethods of double Fourier series in Lipschitz class, BAP, Project Number: 2017-2-TP2-2649, 5551 TL, Manager, 2018,Completed. 100

1. Some extremal problems in approximation theory, BAP, Project Number: BAP-FBE MB (UD) 2007-1 DR , 0 TL, Researcher, 2008,Completed. 50

1. Approximation by trigonometric polynomials to functions belonging to Lipschitz class, BAP, Project Number: BAP-FBE MB (MK) 2012-2 YL , 9516 TL, Advisor, 2014,Completed. 0

1. , TÜBİTAK, Project Number: , EUR, projects.gorevler.8, 2018,Completed. 0

2. Musa Kaya, Approximation by trigonometric polynomials to the functions belonging to Lipschitz class, Graduate School of Natural and Applied Sciences, Mersin University, Completed. 200

1. Hilal Bayındır, Approximation by trigonometric polynomials in generalized Hölder metric, Graduate School of Natural and Applied Sciences, Mersin University, 2015, Completed. 200

2. Hilal Bayındır, , Graduate School of Natural and Applied Sciences, Mersin University, Continue. 400

1. Sibel Yasemin Gölbol, DETERMINATION OF APPROACH PROPERTIES IN SOME CLASSES OF PSI INTEGRALS, Graduate School of Natural and Applied Sciences, Mersin University, 2019, Completed. 400

1. EUROPEAN JOURNAL OF PURE AND APPLIED MATHEMATICS , [ 2019 : 1 ] . 0

2. JOURNAL OF MATHEMATICAL EXTENSION , [ 2019 : 1 ] . 0

1. Wüzburg University, Dept. of Math.-GERMANY , 2013-02-02 - 2013-08-31, Würzburg, Germany.

1. Wüzburg University, Dept. of Math.-GERMANY , 2012-06-07 - 2012-09-02, Würzburg, Germany.

2. Katholische University, Eichstätt- Ingolstadt, Germany , 2010-06-05 - 2010-06-12, Eichstätt- Ingolstadt, Germany.

3. National Academy of Sciences of Ukraine, Institute of Mathematics , 2007-04-05 - 2007-06-23, Kiev, Ukraine.

4. National Academy of Sciences of Ukraine, Institute of Mathematics , 2005-09-07 - 2006-05-06, Kiev, Ukraine.

1. Turkish Mathematical Society , Member No: 33, Turkey, 2002-12-01-Continue.