@article{10_4064_fm_77_2_115_124,
     author = {Jong Lee},
     title = {Homeotopy groups of orientable 2-manifolds},
     journal = {Fundamenta Mathematicae},
     pages = {115--124},
     publisher = {mathdoc},
     volume = {77},
     number = {2},
     year = {1972},
     doi = {10.4064/fm-77-2-115-124},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-77-2-115-124/}
}