@article{DE_1974_10_7_a13,
     author = {V. A. Sadovnichy},
     title = {The zeta-function and eigenvalues of differential operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1276--1285},
     publisher = {mathdoc},
     volume = {10},
     number = {7},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_7_a13/}
}