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@article{MZM_1992_51_4_a4, author = {I. A. Kipriyanov and Yu. V. Zasorin}, title = {Newton's principle for the wave equation}, journal = {Matemati\v{c}eskie zametki}, pages = {36--42}, publisher = {mathdoc}, volume = {51}, number = {4}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_4_a4/} }
I. A. Kipriyanov; Yu. V. Zasorin. Newton's principle for the wave equation. Matematičeskie zametki, Tome 51 (1992) no. 4, pp. 36-42. http://geodesic.mathdoc.fr/item/MZM_1992_51_4_a4/