On the approximation properties of bivariate $(p, q)-$Bernstein   operators
  In the present study, we have given a corrigendum to our paper on the approximation properties of bivariate $(p, q)-$Bernstein operators. Recently, we \cite{kar} have defined the bivariate $(p, q)-$Bernstein operators. Later, we have aware of Acar et. al \cite{acar} already have given some moments. In this case, we have revised \cite[Lemma 2.3]{kar}. 
Ali Karaisa
math.CA