Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1991_27_4_a19, author = {V. A. Il'in and E. I. Moiseev}, title = {A mean-value formula for root functions of the {Schr\"odinger} operator}, journal = {Differencialʹnye uravneni\^a}, pages = {702--705}, publisher = {mathdoc}, volume = {27}, number = {4}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1991_27_4_a19/} }
V. A. Il'in; E. I. Moiseev. A mean-value formula for root functions of the Schr\"odinger operator. Differencialʹnye uravneniâ, Tome 27 (1991) no. 4, pp. 702-705. http://geodesic.mathdoc.fr/item/DE_1991_27_4_a19/