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@article{DAN_1978_238_4_a4, author = {I. S. Kats}, title = {Some general theorems on the density of the spectrum of the string}, journal = {Doklady Akademii Nauk}, pages = {785--788}, publisher = {mathdoc}, volume = {238}, number = {4}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_238_4_a4/} }
I. S. Kats. Some general theorems on the density of the spectrum of the string. Doklady Akademii Nauk, Tome 238 (1978) no. 4, pp. 785-788. http://geodesic.mathdoc.fr/item/DAN_1978_238_4_a4/