@article{10_4064_fm_78_2_107_118,
     author = {Maria Moszy\'nska},
     title = {Various approaches to the fundamental groups},
     journal = {Fundamenta Mathematicae},
     pages = {107--118},
     year = {1973},
     volume = {78},
     number = {2},
     doi = {10.4064/fm-78-2-107-118},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-78-2-107-118/}
}