@article{DAN_1960_130_4_a6,
     author = {D. D. Ivlev},
     title = {Theory of perfectly hardening media},
     journal = {Doklady Akademii Nauk},
     pages = {742--745},
     publisher = {mathdoc},
     volume = {130},
     number = {4},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_4_a6/}
}