1. Akaza, T.: Singular sets of some Kleinian groups. II. Nagoya Math. J. 29, 149–162 (1967)
2. Ahlfors, L., Sario, L.: Riemann surfaces. Princeton mathematical series, vol. 26, xi+382 pp. Princeton University Press, Princeton, N.J. (1960)
3. Atiyah, M.: Riemann surfaces and spin structures. Ann. Sci. École Norm. Sup. (4), 4, 47–62 (1971)
4. Baker, H.F.: Abelian functions. Abel’s theorem and the allied theory of theta functions, Reprint of the 1897 original, xxxvi+684 pp. Cambridge University Press, Cambridge (1995)
5. Beardon, A.F.: A Primer on Riemann Surfaces. London Math. Society Lecture Notes series, vol. 78, x+188 pp. Cambridge University Press, Cambridge (1984)