@article{GDZPPN002486253, title = {Schwach irreduzible Markoff-Operatoren.}, journal = {Monatshefte f\"ur Mathematik}, volume = {105}, year = {1988}, pages = {319-334}, zbl = {0641.47038}, url = {http://dml.mathdoc.fr/item/GDZPPN002486253} }
Wittmann, Rainer. Schwach irreduzible Markoff-Operatoren.. Monatshefte für Mathematik, Tome 105 (1988) pp. 319-334. http://gdmltest.u-ga.fr/item/GDZPPN002486253/