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@article{DAN_1968_178_3_a16, author = {N. H. Ibragimov}, title = {Group properties of wave equations for particles of zero mass}, journal = {Doklady Akademii Nauk}, pages = {566--568}, publisher = {mathdoc}, volume = {178}, number = {3}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a16/} }
N. H. Ibragimov. Group properties of wave equations for particles of zero mass. Doklady Akademii Nauk, Tome 178 (1968) no. 3, pp. 566-568. http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a16/