@article{DAN_1987_294_3_a13,
     author = {L. N. Germanovich and G. P. Cherepanov},
     title = {On the fracture criteria and {Drucker's} postulate},
     journal = {Doklady Akademii Nauk},
     pages = {568--572},
     year = {1987},
     volume = {294},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_3_a13/}
}