@article{GDZPPN002063204, title = {Cylinders in Riemann surfaces}, journal = {Commentarii mathematici Helvetici}, volume = {54}, year = {1979}, pages = {1-5}, zbl = {0401.30036}, url = {http://dml.mathdoc.fr/item/GDZPPN002063204} }
Randol, Burton. Cylinders in Riemann surfaces. Commentarii mathematici Helvetici, Tome 54 (1979) pp. 1-5. http://gdmltest.u-ga.fr/item/GDZPPN002063204/