@article{10_4153_CMB_1995_002_0,
     author = {Bellow, A. and Calder\'on, A. P.},
     title = {Hopf's {Ergodic} {Theorem} for {Particles} with {Different} {Velocities} and the {"Strong} {Sweeping} out {Property"}},
     journal = {Canadian mathematical bulletin},
     pages = {11--15},
     year = {1995},
     volume = {38},
     number = {1},
     doi = {10.4153/CMB-1995-002-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1995-002-0/}
}