@article{10_4153_CJM_1973_079_6,
     author = {Lamb, Charles W.},
     title = {A {Ratio} {Limit} {Theorem} for {Approximate} {Martingales}},
     journal = {Canadian journal of mathematics},
     pages = {772--779},
     year = {1973},
     volume = {25},
     number = {4},
     doi = {10.4153/CJM-1973-079-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-079-6/}
}