@article{DAN_1971_199_2_a19,
     author = {L. V. Skobeleva and P. I. Nikitichev and G. V. Kleshchev and A. N. Bryzgalov and L. N. Chernyi and T. N. Kitaeva},
     title = {Passive faces and defective surfaces of crystals},
     journal = {Doklady Akademii Nauk},
     pages = {327--330},
     publisher = {mathdoc},
     volume = {199},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_199_2_a19/}
}