@article{DAN_1981_260_3_a27,
     author = {V. A. Petrovsky},
     title = {On the nature of zonal structure of crystals},
     journal = {Doklady Akademii Nauk},
     pages = {630--633},
     publisher = {mathdoc},
     volume = {260},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_3_a27/}
}