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@article{AA_1998_10_2_a6, author = {A. S. Matveev}, title = {On the convexity of the images of quadratic mappings}, journal = {Algebra i analiz}, pages = {159--196}, publisher = {mathdoc}, volume = {10}, number = {2}, year = {1998}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1998_10_2_a6/} }
A. S. Matveev. On the convexity of the images of quadratic mappings. Algebra i analiz, Tome 10 (1998) no. 2, pp. 159-196. http://geodesic.mathdoc.fr/item/AA_1998_10_2_a6/