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@article{DAN_1980_250_6_a2, author = {S. L. Ziglin}, title = {Nonintegrability of a problem on the motion of four point vortices}, journal = {Doklady Akademii Nauk}, pages = {1296--1300}, publisher = {mathdoc}, volume = {250}, number = {6}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1980_250_6_a2/} }
S. L. Ziglin. Nonintegrability of a problem on the motion of four point vortices. Doklady Akademii Nauk, Tome 250 (1980) no. 6, pp. 1296-1300. http://geodesic.mathdoc.fr/item/DAN_1980_250_6_a2/