@article{MOMA_1976__82_177781,
     author = {Karl Sigmund},
     title = {On the {Distribution} of {Periodic} {Points} for {{\ss}-Shifts.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {247--252},
     publisher = {mathdoc},
     volume = {82},
     year = {1976},
     zbl = {0333.58008},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1976__82_177781/}
}