@article{DAN_1988_300_4_a19,
     author = {A. A. Kaminskii},
     title = {On the laws of disordering of the $\mathrm{Ln}^{3+}$-ion crystal field in insulating crystals},
     journal = {Doklady Akademii Nauk},
     pages = {849--852},
     publisher = {mathdoc},
     volume = {300},
     number = {4},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_300_4_a19/}
}