%0 Journal Article %T THE CALCULATION OF SPHERICAL SHELLS OF BIMODULUS NONLINEAR ELASTIC MATERIAL OF STEPPER METHOD USING THE MATRIX DIFFERENTIATION %A Petrakov, A.A. %K %J Bulletin of Belgorod State Technological University named after. V. G. Shukhov %D 2017 %N 2 %P 5 %I Belgorod State Technological University named after V.G. Shukhov