@article{CMH_1978__53_139746,
     author = {Isaac Chavel and Edgar A. Feldman},
     title = {Cylinders on surfaces.},
     journal = {Commentarii mathematici Helvetici},
     pages = {439--447},
     year = {1978},
     volume = {53},
     zbl = {0414.53032},
     url = {http://geodesic.mathdoc.fr/item/CMH_1978__53_139746/}
}