MathSciNet bibliographic data MR740316 (86i:22021) 22E40 (11F46 17B67) Yoshida, Masaaki Discrete reflection groups in a parabolic subgroup of ${\rm Sp}(2,\,{\bf R})$${\rm Sp}(2,\,{\bf R})$ and symmetrizable hyperbolic generalized Cartan matrices of rank $3$$3$. J. Math. Soc. Japan 36 (1984), no. 2, 243–258. Article

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