MathSciNet bibliographic data MR752798 11F03 (11J70 30F99) Lehner, J.; Sheingorn, M. Simple closed geodesics on \$H\sp{+}/\Gamma (3)\$$H\sp{+}/\Gamma (3)$ arise from the Markov spectrum. Bull. Amer. Math. Soc. (N.S.) 11 (1984), no. 2, 359–362. Article

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