@article{GDZPPN002471833, title = {Number of Recurring Cycles.}, journal = {Monatshefte f\"ur Mathematik}, volume = {60}, year = {1956}, pages = {183-189}, zbl = {0071.26906}, url = {http://dml.mathdoc.fr/item/GDZPPN002471833} }
Parameswaran, S. Number of Recurring Cycles.. Monatshefte für Mathematik, Tome 60 (1956) pp. 183-189. http://gdmltest.u-ga.fr/item/GDZPPN002471833/