@article{DE_1985_21_1_a8,
     author = {N. Yu. Kapustin and A. S. Makin},
     title = {Order-exact relations of anti-a-priori type between eigen- and associated functions of an elliptic operator of arbitrary order},
     journal = {Differencialʹnye uravneni\^a},
     pages = {58--65},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_1_a8/}
}