On the convexity of the images of quadratic mappings
Algebra i analiz, Tome 10 (1998) no. 2, pp. 159-196.

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     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/}
}
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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/