@article{RCM_1979__13_181680,
     author = {David Mond},
     title = {Sobre {La} {Definicion} {Del} {Primer} {Grupo} {De} {Homologia} {En} {Los} {Abiertos} {Del} {Plano.}},
     journal = {Revista colombiana de matematicas},
     pages = {121--138},
     publisher = {mathdoc},
     volume = {13},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/RCM_1979__13_181680/}
}