A lower bound of the sum of the squares of the fundamental functions, and of the number of the fundamental values, for an arbitrary $FSF$ of Laplace's operator
Differencialʹnye uravneniâ, Tome 6 (1970) no. 1, pp. 7-16.

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     author = {V. A. Il'in},
     title = {A lower bound of the sum of the squares of the fundamental functions, and of the number of the fundamental values, for an arbitrary $FSF$ of {Laplace's} operator},
     journal = {Differencialʹnye uravneni\^a},
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     number = {1},
     year = {1970},
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     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_1_a1/}
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V. A. Il'in. A lower bound of the sum of the squares of the fundamental functions, and of the number of the fundamental values, for an arbitrary $FSF$ of Laplace's operator. Differencialʹnye uravneniâ, Tome 6 (1970) no. 1, pp. 7-16. http://geodesic.mathdoc.fr/item/DE_1970_6_1_a1/