Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1994_335_3_a2, author = {M. G. Zavgorodnii}, title = {Spectral completeness of root functions of a boundary value}, journal = {Doklady Akademii Nauk}, pages = {281--283}, publisher = {mathdoc}, volume = {335}, number = {3}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1994_335_3_a2/} }
M. G. Zavgorodnii. Spectral completeness of root functions of a boundary value. Doklady Akademii Nauk, Tome 335 (1994) no. 3, pp. 281-283. http://geodesic.mathdoc.fr/item/DAN_1994_335_3_a2/