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@article{FORUM_1994__6_3_141729, author = {Emmanuel Preissmann}, title = {On the length of the period of ...d.}, journal = {Forum mathematicum}, pages = {137--138}, publisher = {mathdoc}, volume = {6}, number = {3}, year = {1994}, zbl = {0793.11006}, url = {http://geodesic.mathdoc.fr/item/FORUM_1994__6_3_141729/} }
Emmanuel Preissmann. On the length of the period of ...d.. Forum mathematicum, Tome 6 (1994) no. 3, pp. 137-138. http://geodesic.mathdoc.fr/item/FORUM_1994__6_3_141729/