@article{10_4064_fm_74_1_47_71,
     author = {Ralph Fox},
     title = {On shape},
     journal = {Fundamenta Mathematicae},
     pages = {47--71},
     publisher = {mathdoc},
     volume = {74},
     number = {1},
     year = {1972},
     doi = {10.4064/fm-74-1-47-71},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-74-1-47-71/}
}