TY - JOUR AU - Ying, Ge TI - Spaces with countable $sn$-networks JO - Commentationes Mathematicae Universitatis Carolinae PY - 2004 SP - 169 EP - 176 VL - 45 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_2004__45_1_a12/ LA - en ID - CMUC_2004__45_1_a12 ER -