@article{DE_1988_24_4_a26,
     author = {V. N. Pivovarchik},
     title = {On the number of eigenvalues of the {Sturm--Liouville} problem on the semiaxis with a potential that is linear with respect to the parameter},
     journal = {Differencialʹnye uravneni\^a},
     pages = {705--708},
     publisher = {mathdoc},
     volume = {24},
     number = {4},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_4_a26/}
}