SUNAGA, J: Some arithmetic Fuchsian groups with signature $(0;e_1,e_2,e_3,e_4)$ II
Saitama Mathematical Journal 1997(Vol. 15) pp.15-46
Abstract
We determine the set of generators of arithmetic Fuchsian groups
with signature
(0; e1, e2, e3,
e4) which are the subgroups
of the normalizers
of maximal orders O
in division quaternion algebras A over the rational number field Q