@article{JRAM_1973__0262_0263_151363,
     author = {Yu. Manin and V. Drinfeld},
     title = {Periods of p-adic {Schottky} groups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {239--247},
     publisher = {mathdoc},
     volume = {0262_0263},
     year = {1973},
     zbl = {0275.14017},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__0262_0263_151363/}
}