@article{10_4064_fm187_2_1,
     author = {G. R. Conner and J. W. Lamoreaux},
     title = {On the existence of universal covering spaces
for metric spaces and subsets of the {Euclidean} plane},
     journal = {Fundamenta Mathematicae},
     pages = {95--110},
     publisher = {mathdoc},
     volume = {187},
     number = {2},
     year = {2005},
     doi = {10.4064/fm187-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm187-2-1/}
}