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@article{DAN_1992_324_2_a16, author = {Ya. N. Fel'd}, title = {On the quadratic lemma in electrodynamics}, journal = {Doklady Akademii Nauk}, pages = {321--324}, publisher = {mathdoc}, volume = {324}, number = {2}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_324_2_a16/} }
Ya. N. Fel'd. On the quadratic lemma in electrodynamics. Doklady Akademii Nauk, Tome 324 (1992) no. 2, pp. 321-324. http://geodesic.mathdoc.fr/item/DAN_1992_324_2_a16/