@article{CMH_1974__49_139576,
     author = {Frank Quinn},
     title = {Almost {Canonical} {Inverse} {Images}},
     journal = {Commentarii mathematici Helvetici},
     pages = {168--174},
     publisher = {mathdoc},
     volume = {49},
     year = {1974},
     zbl = {0318.57014},
     url = {http://geodesic.mathdoc.fr/item/CMH_1974__49_139576/}
}