TY - JOUR AU - Kerner, Michael TI - Abstract differential geometry JO - Compositio Mathematica PY - 1937 SP - 308 EP - 341 VL - 4 PB - Johnson Reprint Corporation UR - http://www.numdam.org/item/CM_1937__4__308_0/ LA - en ID - CM_1937__4__308_0 ER -