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@article{PORMA_1988__45_4_115636, author = {Craveiro de Carvalho, F.J.}, title = {Projections of transnormal twisted spheres}, journal = {Portugaliae mathematica}, pages = {347--349}, publisher = {mathdoc}, volume = {45}, number = {4}, year = {1988}, mrnumber = {0982903}, zbl = {0664.53027}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1988__45_4_115636/} }
Craveiro de Carvalho, F.J. Projections of transnormal twisted spheres. Portugaliae mathematica, Tome 45 (1988) no. 4, pp. 347-349. http://geodesic.mathdoc.fr/item/PORMA_1988__45_4_115636/