1. ON THE USE OF ABEL-JENSEN TYPE COMBINATORIAL FORMULAS FOR CONSTRUCTION AND INVESTIGATION OF SOME ALGEBRAIC POLYNOMIAL OPERATORS OF APPROXIMATION. Authors: ELENA IULIA STOICA, DIMITRIE D. STANCU.2. ON THE COMBINATORIAL IDENTITIES OF ABEL-HURWITZ TYPE AND THEIR USE IN CONSTRUCTIVE THEORY OF FUNCTIONS. Authors: ELENA IULIA STOICA.