@article{10_4153_CJM_1979_048_2,
     author = {Fong, Humphrey},
     title = {Ratio and {Stochastic} {Ergodic} {Theorems} for {Superadditive} {Processes}},
     journal = {Canadian journal of mathematics},
     pages = {441--447},
     year = {1979},
     volume = {31},
     number = {2},
     doi = {10.4153/CJM-1979-048-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-048-2/}
}