@article{MZM_1993_53_6_a16,
     author = {R. V. Guseinov},
     title = {Spectrum of quasielliptic differential operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {145--148},
     publisher = {mathdoc},
     volume = {53},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_6_a16/}
}