@article{10_4153_CMB_1976_058_4,
     author = {Schafer, James A.},
     title = {Representing {Homology} {Classes} on {Surfaces}},
     journal = {Canadian mathematical bulletin},
     pages = {373--374},
     year = {1976},
     volume = {19},
     number = {3},
     doi = {10.4153/CMB-1976-058-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-058-4/}
}