@article{GDZPPN00230600X,
title = {Markoff Forms and Primitive Words.},
journal = {Mathematische Annalen},
volume = {196},
year = {1972},
pages = {8-22},
zbl = {0227.10018},
url = {http://dml.mathdoc.fr/item/GDZPPN00230600X}
}
Cohn, Harvey. Markoff Forms and Primitive Words.. Mathematische Annalen, Tome 196 (1972) pp. 8-22. http://gdmltest.u-ga.fr/item/GDZPPN00230600X/