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@article{DAN_1988_300_3_a15, author = {Ya. N. Fel'd}, title = {A criterion for the realizability of direction diagrams by}, journal = {Doklady Akademii Nauk}, pages = {583--587}, publisher = {mathdoc}, volume = {300}, number = {3}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1988_300_3_a15/} }
Ya. N. Fel'd. A criterion for the realizability of direction diagrams by. Doklady Akademii Nauk, Tome 300 (1988) no. 3, pp. 583-587. http://geodesic.mathdoc.fr/item/DAN_1988_300_3_a15/