@article{GDZPPN002062429, title = {A Poncelet theorem in space.}, journal = {Commentarii mathematici Helvetici}, volume = {52}, year = {1977}, pages = {145-160}, zbl = {0358.50009}, url = {http://dml.mathdoc.fr/item/GDZPPN002062429} }
Harris, Joe; Griffiths, Phillip. A Poncelet theorem in space.. Commentarii mathematici Helvetici, Tome 52 (1977) pp. 145-160. http://gdmltest.u-ga.fr/item/GDZPPN002062429/