@article{1102996008, author = {Orland, George H.}, title = {On non-convex polyhedral surfaces in $E^3$.}, journal = {Pacific J. Math.}, volume = {15}, number = {4}, year = {1965}, pages = { 267-272}, language = {en}, url = {http://dml.mathdoc.fr/item/1102996008} }
Orland, George H. On non-convex polyhedral surfaces in $E^3$.. Pacific J. Math., Tome 15 (1965) no. 4, pp. 267-272. http://gdmltest.u-ga.fr/item/1102996008/