Geodesic
A majorant for the multiplicities of eigenvalues of the Laplace operator with periodic conditions
Matematičeskie trudy, Tome 20 (2017) no. 1, pp. 75-80.

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In the case of periodic conditions, we find explicit upper estimates in terms of power functions for the multiplicities $r_n(p)$ of eigenvalues of the Laplace operator. 
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V. L. Vaskevich. A majorant for the multiplicities of eigenvalues of the Laplace operator with periodic conditions. Matematičeskie trudy, Tome 20 (2017) no. 1, pp. 75-80. http://geodesic.mathdoc.fr/item/MT_2017_20_1_a3/

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