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@article{MS2_1978__43_166599, author = {Henry W. Hansen}, title = {On the {Gaussian} {Markoff} spectrum.}, journal = {Mathematica Scandinavica}, pages = {35--43}, publisher = {mathdoc}, volume = {43}, year = {1978}, zbl = {0402.10031}, url = {http://geodesic.mathdoc.fr/item/MS2_1978__43_166599/} }
Henry W. Hansen. On the Gaussian Markoff spectrum.. Mathematica Scandinavica, Tome 43 (1978), pp. 35-43. http://geodesic.mathdoc.fr/item/MS2_1978__43_166599/