@article{DE_1998_34_12_a10,
     author = {M. B. Tabanov},
     title = {New natural ellipsoidal coordinates and normal forms of equations for wave functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1660--1665},
     publisher = {mathdoc},
     volume = {34},
     number = {12},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_12_a10/}
}