@article{05029485, title = {Asphericity of shadows of a convex body.}, journal = {Zapiski Nauchnykh Seminarov POMI}, volume = {321}, year = {2005}, pages = {67-78}, doi = {10.1007/s10958-007-0434-5}, zbl = {1151.52302}, language = {en}, url = {http://dml.mathdoc.fr/item/05029485} }
Makeev, V.V. Asphericity of shadows of a convex body.. Zapiski Nauchnykh Seminarov POMI, Tome 321 (2005) pp. 67-78. doi : 10.1007/s10958-007-0434-5. http://gdmltest.u-ga.fr/item/05029485/