@article{DAN_1985_282_2_a13,
     author = {V. N. Opekunov and A. A. Urusovskaya and V. R. Regel},
     title = {The microhardness study of alkali-halide crystals},
     journal = {Doklady Akademii Nauk},
     pages = {320--323},
     year = {1985},
     volume = {282},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_282_2_a13/}
}