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@article{MZM_1971_10_3_a11, author = {I. Ivanova-Karatopraklieva}, title = {Nonrigidity of certain composite surfaces of revolution}, journal = {Matemati\v{c}eskie zametki}, pages = {333--344}, publisher = {mathdoc}, volume = {10}, number = {3}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_3_a11/} }
I. Ivanova-Karatopraklieva. Nonrigidity of certain composite surfaces of revolution. Matematičeskie zametki, Tome 10 (1971) no. 3, pp. 333-344. http://geodesic.mathdoc.fr/item/MZM_1971_10_3_a11/