@article{10_4064_fm_95_2_111_127,
     author = {Gerald Ungar},
     title = {ANR's and {NES's} in the category of mappings on metric spaces},
     journal = {Fundamenta Mathematicae},
     pages = {111--127},
     publisher = {mathdoc},
     volume = {95},
     number = {2},
     year = {1977},
     doi = {10.4064/fm-95-2-111-127},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-95-2-111-127/}
}