@article{02217504, title = {Image sets of folding surfaces.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2005}, year = {2005}, pages = {91-97}, doi = {10.1155/IJMMS.2005.91}, zbl = {1079.53053}, language = {en}, url = {http://dml.mathdoc.fr/item/02217504} }
D'Azevedo Breda, Ana M. Image sets of folding surfaces.. International Journal of Mathematics and Mathematical Sciences, Tome 2005 (2005) pp. 91-97. doi : 10.1155/IJMMS.2005.91. http://gdmltest.u-ga.fr/item/02217504/