Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1976_12_1_a18, author = {B. W. Schulze}, title = {Potentials for higher order elliptic equations, and inverse problems}, journal = {Differencialʹnye uravneni\^a}, pages = {148--158}, publisher = {mathdoc}, volume = {12}, number = {1}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_1_a18/} }
B. W. Schulze. Potentials for higher order elliptic equations, and inverse problems. Differencialʹnye uravneniâ, Tome 12 (1976) no. 1, pp. 148-158. http://geodesic.mathdoc.fr/item/DE_1976_12_1_a18/