@article{VSGTU_2011_1_a26,
     author = {V. A. Kovalev and Yu. N. Radaev},
     title = {An optimal system of one-dimensional subalgebras for the symmetry algebra of three-dimensional equations of the perfect plasticity},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {196--220},
     publisher = {mathdoc},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2011_1_a26/}
}