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@article{MZM_1997_61_6_a16, author = {A. A. Lokshin}, title = {On the concavity of the surface of eigenvalues}, journal = {Matemati\v{c}eskie zametki}, pages = {946--949}, publisher = {mathdoc}, volume = {61}, number = {6}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1997_61_6_a16/} }
A. A. Lokshin. On the concavity of the surface of eigenvalues. Matematičeskie zametki, Tome 61 (1997) no. 6, pp. 946-949. http://geodesic.mathdoc.fr/item/MZM_1997_61_6_a16/
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