@article{FPM_2005_11_5_a6,
     author = {V. N. Karpushkin},
     title = {Estimates of sums of zero multiplicities for eigenfunctions of the {Laplace{\textendash}Beltrami} operator},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {85--90},
     year = {2005},
     volume = {11},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2005_11_5_a6/}
}