Bivariate Cheney-Sharma operators on simplex
  In this paper, we consider bivariate Cheney-Sharma operators which are not the tensor product construction. Precisely, we show that these operators preserve Lipschitz condition of a given Lipschitz continuous function f and also the properties of the modulus of continuity function when f is a modulus of continuity function. 
G\"ulen Ba\c{s}canbaz-Tunca, Ay\c{s}eg\"ul Eren\c{c}in, Hatice G\"ul   \.Ince \.Ilarslan
math.FA