@article{JTNB_2009__21_3_757_0,
     author = {Srinivasan, Anitha},
     title = {Markoff numbers and ambiguous classes},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {757--770},
     publisher = {Universit\'e Bordeaux 1},
     volume = {21},
     number = {3},
     year = {2009},
     doi = {10.5802/jtnb.701},
     zbl = {1209.11036},
     mrnumber = {2605546},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/jtnb.701/}
}