@article{DAN_1957_112_5_a13, author = {B. B. Kadomtsev}, title = {The invariance principle for a homogeneous medium of arbitrary shape}, journal = {Doklady Akademii Nauk}, pages = {831--834}, publisher = {mathdoc}, volume = {112}, number = {5}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_5_a13/} }