TY - JOUR AU - R. B. Sher TI - Products and sums of absolute proper retracts JO - Colloquium Mathematicum PY - 1975 SP - 91 EP - 102 VL - 33 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-33-1-91-102/ DO - 10.4064/cm-33-1-91-102 LA - en ID - 10_4064_cm_33_1_91_102 ER -