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@article{MZM_1985_37_2_a11, author = {A. A. Dezin}, title = {Spectral characteristics of general boundary-value problems for operator~$D^2$}, journal = {Matemati\v{c}eskie zametki}, pages = {249--256}, publisher = {mathdoc}, volume = {37}, number = {2}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1985_37_2_a11/} }
A. A. Dezin. Spectral characteristics of general boundary-value problems for operator~$D^2$. Matematičeskie zametki, Tome 37 (1985) no. 2, pp. 249-256. http://geodesic.mathdoc.fr/item/MZM_1985_37_2_a11/