@incollection{AST_1976__40__113_0,
     author = {Kubo, Izumi},
     title = {The motion of disks in a torus},
     booktitle = {International conference on dynamical systems in mathematical physics},
     series = {Ast\'erisque},
     pages = {113--116},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {40},
     year = {1976},
     mrnumber = {448444},
     zbl = {0344.58018},
     language = {en},
     url = {http://www.numdam.org/item/AST_1976__40__113_0/}
}