Parametrization of reflection groups acting in a disk. Mika Seppälä; Tuomas Sorvali — 1989 Manuscripta mathematica
Traces of commutators of Möbius transformations. Mika Seppälä; Tuomas Sorvali — 1991 Mathematica Scandinavica
Leftings of Möbius groups to matrix groups. Mika Seppälä; Tuomas Sorvali — 1993 Mathematica Scandinavica
The effect of the rotation group on the behaviour of a rotation automorphic function. Tuomas Sorvali; Rauno Aulaskari — 1986 Mathematica Scandinavica
Parametrization of Möbius groups acting in a disk. Mika Seppälä; Tuomas Sorvali — 1986 Commentarii mathematici Helvetici