TY - JOUR AU - Isaac Kornfeld AU - Wojciech Kosek TI - Positive $L^1$ operators associated with nonsingular mappings and an example of E. Hille JO - Colloquium Mathematicum PY - 2003 SP - 63 EP - 77 VL - 98 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm98-1-5/ DO - 10.4064/cm98-1-5 LA - en ID - 10_4064_cm98_1_5 ER -