@article{PORMA_1967__26_3_115040,
     author = {Kambayashi, T.},
     title = {A convergence criterion for multiple ratios},
     journal = {Portugaliae mathematica},
     pages = {375--379},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1967},
     mrnumber = {0256258},
     zbl = {0212.36903},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_3_115040/}
}