@article{GDZPPN002057352, title = {On a Class of Null-Bounded RIEMANN Surfaces.}, journal = {Commentarii mathematici Helvetici}, volume = {34}, year = {1960}, pages = {52-66}, zbl = {0113.05702}, url = {http://dml.mathdoc.fr/item/GDZPPN002057352} }
Royden, H.L. On a Class of Null-Bounded RIEMANN Surfaces.. Commentarii mathematici Helvetici, Tome 34 (1960) pp. 52-66. http://gdmltest.u-ga.fr/item/GDZPPN002057352/