@article{GDZPPN00206099X, title = {Some Global Theorems on Non-Complete Surfaces}, journal = {Commentarii mathematici Helvetici}, volume = {48}, year = {1973}, pages = {177-187}, zbl = {0265.53001}, url = {http://dml.mathdoc.fr/item/GDZPPN00206099X} }
Yau, Shing-Tung. Some Global Theorems on Non-Complete Surfaces. Commentarii mathematici Helvetici, Tome 48 (1973) pp. 177-187. http://gdmltest.u-ga.fr/item/GDZPPN00206099X/