@article{DAN_1962_143_2_a15,
     author = {L. V. Ershov},
     title = {On the formulation of the mining stability problem},
     journal = {Doklady Akademii Nauk},
     pages = {305--307},
     publisher = {mathdoc},
     volume = {143},
     number = {2},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a15/}
}