@article{MZM_1980_27_5_a10,
     author = {E. G. D'yakonov and M. Yu. Orekhov},
     title = {Minimization of the computational labor in determining the first eigenvalues of differential operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {795--812},
     publisher = {mathdoc},
     volume = {27},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a10/}
}