TY - JOUR AU - Croom, F. H. TI - Homotopy type of mapping tracks JO - Compositio Mathematica PY - 1970 SP - 261 EP - 264 VL - 22 IS - 3 PB - Wolters-Noordhoff Publishing UR - http://www.numdam.org/item/CM_1970__22_3_261_0/ LA - en ID - CM_1970__22_3_261_0 ER -