@article{MAT_1962_6_3_a2,
     author = {E. Hopf},
     title = {On the ergodic theorem for positive linear operators},
     journal = {Matematika},
     pages = {29--36},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1962_6_3_a2/}
}