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• [1] T. Acar: Asymptotic formulas for generalized Szász-–Mirakyan operators, Appl. Math. Comput. 263 (2015), 233-239.
• [2] T. Acar, V. Gupta and A. Aral: Rate of convergence for generalized Szász operators, Bull. Math. Sci. 1 (1)(2011), 99–113.
• [3] R. P. Agarwal and V. Gupta: On q-analogue of a complex summation-integral type operators in compact disks, J. Inequal. Appl. 2012 (1) (2012), Art. 111.
• [4] A. Aral, V. Gupta and R. P. Agarwal: Applications of q Calculus in Operator Theory, Springer-Verlag, New York, 2013.
• [5] A. M. Acu and I. Rasa: New estimates for the differences of positive linear operators, Numer. Algorithms 73(2016), 775—789.
• [6] O. Agratini: On a sequence of linear and positive operators, Facta Univ. (NIS) Ser. Math. Inform. 14 (1999), 41-–48.
• [7] A. Aral, D. Inoan and I. Rasa: On differences of linear positive operators, Anal. Math. Phys.(2018). DOI https://doi.org/10.1007/s1332
• [8] M. Bodur, O. G. Yılmaz and A. Aral: Approximation by Baskakov-Szász-Stancu operators preserving exponential functions, Const. Math. Anal. 1 (1) (2018), 1–8.
• [9] N. Deo: Faster rate of convergence on Srivastava—Gupta operators, Appl. Math. Comput. 218 (21)(2012), 10486–10491.
• [10] S. G. Gal and V. Gupta: Quantitative estimates for a new complex Durrmeyer operator in compact disks, Appl. Math. Comput. 218 (6) (2011), 2944–2951.
• [11] V. Gupta: On difference of operators with applications to Szász type operators, communicated.
• [12] V. Gupta: An estimate on the convergence of Baskakov—Bézier operators, J. Math. Anal. Appl. 312 (1)(2005), 280–288.
• [13] V. Gupta, Th. M. Rassias and R. Yadav: Approximation by Lupa¸s-Beta integral operators, Appl. Math. Comput. 236 (2014), 19–26.
• [14] V. Gupta, T. M. Rassias, P. N. Agrawal and A. M. Acu: Recent Advances in Constructive Approximation Theory, Springer Optimization and Its Applications, vol. 138, (2018), Springer, Cham.
• [15] V. Gupta and R. Yadav: On approximation of certain integral operators, Acta Math. Vietnam. 39 (2)(2014), 193–203.
• [16] A. Lupaş: The approximation by means of some linear positive operators, In: Approximation Theory (M.W. Müller others, eds), pp. 201—227. Akademie-Verlag, Berlin (1995).