TY - JOUR AU - Gerald Ungar TI - ANR's and NES's in the category of mappings on metric spaces JO - Fundamenta Mathematicae PY - 1977 SP - 111 EP - 127 VL - 95 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-95-2-111-127/ DO - 10.4064/fm-95-2-111-127 LA - en ID - 10_4064_fm_95_2_111_127 ER -