TY - JOUR AU - Bellow, A. AU - Calderón, A. P. TI - Hopf's Ergodic Theorem for Particles with Different Velocities and the "Strong Sweeping out Property" JO - Canadian mathematical bulletin PY - 1995 SP - 11 EP - 15 VL - 38 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1995-002-0/ DO - 10.4153/CMB-1995-002-0 ID - 10_4153_CMB_1995_002_0 ER -