Geodesic
Coxeter decompositions of hyperbolic tetrahedra
Fundamentalʹnaâ i prikladnaâ matematika, Tome 9 (2003) no. 1, pp. 263-275

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In this paper we classify all Coxeter decompositions of hyperbolic tetrahedra. Using this classification one can find all Coxeter subgroups of the group generated by reflections with respect to the faces of the tetrahedra. The indices of such subgroups easily follow from the classification also. 
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     title = {Coxeter decompositions of hyperbolic tetrahedra},
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A. A. Felikson. Coxeter decompositions of hyperbolic tetrahedra. Fundamentalʹnaâ i prikladnaâ matematika, Tome 9 (2003) no. 1, pp. 263-275. http://geodesic.mathdoc.fr/item/FPM_2003_9_1_a16/