Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1991__206_1_174212, author = {J. Sj\"ostrand and A.G. Ramm}, title = {An inverse problem of the wave equation.}, journal = {Mathematische Zeitschrift}, pages = {119--130}, publisher = {mathdoc}, volume = {206}, number = {1}, year = {1991}, zbl = {0697.35164}, url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174212/} }
J. Sjöstrand; A.G. Ramm. An inverse problem of the wave equation.. Mathematische Zeitschrift, Tome 206 (1991) no. 1, pp. 119-130. http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174212/