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@article{JRAM_1984__350_152640, author = {Tudor Zamfirescu}, title = {Points of infinitely many normals to convex surfaces.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {183--187}, publisher = {mathdoc}, volume = {350}, year = {1984}, zbl = {0557.52004}, url = {http://geodesic.mathdoc.fr/item/JRAM_1984__350_152640/} }
Tudor Zamfirescu. Points of infinitely many normals to convex surfaces.. Journal für die reine und angewandte Mathematik, Tome 350 (1984), pp. 183-187. http://geodesic.mathdoc.fr/item/JRAM_1984__350_152640/