@article{RCM_1975__9_181639,
     author = {Harold Bell},
     title = {Some topological extensions of plane geometry},
     journal = {Revista colombiana de matematicas},
     pages = {125--154},
     publisher = {mathdoc},
     volume = {9},
     year = {1975},
     zbl = {0331.54023},
     url = {http://geodesic.mathdoc.fr/item/RCM_1975__9_181639/}
}