@article{MOMA_1983__96_178151,
     author = {Bernhard Dietz},
     title = {On the {Gaps} of the {Markoff} {Spectrum.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {265--268},
     publisher = {mathdoc},
     volume = {96},
     year = {1983},
     zbl = {0517.10021},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1983__96_178151/}
}