Simultaneous approximation with generalized Durrmeyer operators. - Gülsüm Ulusoy; Emre Deniz; Ali Aral (Appl. Math. Comput., 2015)

Approximation by modified Szász-Durrmeyer operators. - Tuncer Acar; Gülsüm Ulusoy (Period. Math. Hung., 2016)

A new construction of Szász-Mirakyan operators. - Ali Aral; Gülsüm Ulusoy; Emre Deniz (Numer. Algorithms, 2018)