@article{ZVMMF_1967_7_2_a22,
     author = {A. S. Kalashnikov},
     title = {The occurrence of singularities in solutions of the non-steady seepage equation},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {440--444},
     year = {1967},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1967_7_2_a22/}
}