00534naa#a2200169#i#450# EN\\bibl\2690 20240809102004.5 1992-5980 20140630b2014####ek#y0engy0150####ca RUS RU On presentation of Gelfond–Leontiev operators of generalized differentiation in simply connected region Journal article rostov on don Don state technical University 2014 0 с. Journal article local Bratishchev Aleksandr naukaru.ru