00673naa#a2200169#i#450# EN\\bibl\17849 20240430004137.2 2071-7318 20170925b2017####ek#y0engy0150####ca RU THE CALCULATION OF SPHERICAL SHELLS OF BIMODULUS NONLINEAR ELASTIC MATERIAL OF STEPPER METHOD USING THE MATRIX DIFFERENTIATION Journal article Belgorod Belgorod State Technological University named after V.G. Shukhov 2017 5 с. Journal article local Инженерное дело. Техника в целом. Транспорт. 62 Petrakov Aleksandr Andreevich naukaru.ru