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@article{DAN_1961_136_1_a3, author = {L. V. Keldysh}, title = {Imbedding into $E^4$ of some monotonic images of $E^3$}, journal = {Doklady Akademii Nauk}, pages = {18--21}, publisher = {mathdoc}, volume = {136}, number = {1}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_1_a3/} }
L. V. Keldysh. Imbedding into $E^4$ of some monotonic images of $E^3$. Doklady Akademii Nauk, Tome 136 (1961) no. 1, pp. 18-21. http://geodesic.mathdoc.fr/item/DAN_1961_136_1_a3/