TY - JOUR AU - Muro, Fernando TI - Homotopy theory of non-symmetric operads, II: Change of base category and left properness JO - Algebraic and Geometric Topology PY - 2014 SP - 229 EP - 281 VL - 14 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.2140/agt.2014.14.229/ DO - 10.2140/agt.2014.14.229 ID - 10_2140_agt_2014_14_229 ER -