TY - JOUR T1 - Axiomatic homotopy theory for operads JO - COMMENT MATH HELV PY - 2003/01/01 AU - Berger C AU - Moerdijk I ED - DO - DOI: 10.1007/s00014-003-0772-y VL - 78 IS - 4 SP - 805 EP - 831 Y2 - 2024/12/22 ER -