TY - JOUR AU - Karol Borsuk TI - On fundamental deformation retracts and on some related notions JO - Fundamenta Mathematicae PY - 1974 SP - 261 EP - 270 VL - 86 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-86-3-261-270/ DO - 10.4064/fm-86-3-261-270 LA - en ID - 10_4064_fm_86_3_261_270 ER -