@article{Petrakov2017the,
author={Petrakov, A.A.},
title={THE CALCULATION OF SPHERICAL SHELLS OF BIMODULUS NONLINEAR ELASTIC  MATERIAL OF STEPPER METHOD USING THE MATRIX DIFFERENTIATION},
journal={Bulletin of Belgorod State Technological University named after. V. G. Shukhov},
publisher={Belgorod State Technological University named after V.G. Shukhov},
year={2017},
pages={177-182},
volume={2},
issue={9},
}