@article{GDZPPN000364789, title = {On the Global Structure of Crystalline Surfaces.}, journal = {Discrete \& computational geometry}, volume = {6}, year = {1991}, pages = {225-262}, zbl = {0725.53012}, url = {http://dml.mathdoc.fr/item/GDZPPN000364789} }
Taylor, J.E. On the Global Structure of Crystalline Surfaces.. Discrete & computational geometry, Tome 6 (1991) pp. 225-262. http://gdmltest.u-ga.fr/item/GDZPPN000364789/