@article{DAN_1980_253_1_a6,
     author = {M. Yu. Orekhov},
     title = {On estimates of the computational work in finding the first eigenvalues of some differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {34--38},
     publisher = {mathdoc},
     volume = {253},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_253_1_a6/}
}