@article{DAN_1957_116_1_a7,
     author = {Yu. M. Liberman},
     title = {On the type of the equations in the theory of plasticity},
     journal = {Doklady Akademii Nauk},
     pages = {32--34},
     publisher = {mathdoc},
     volume = {116},
     number = {1},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_1_a7/}
}