We provide an argument, based on Schottky groups, of a result due to B. Maskit which states a necessary and sufficient condition for the double oriented cover of a planar compact Klein surface of algebraic genus at least two to be a hyperelliptic Riemann surface.
@article{1435, title = {A Short Note On M-Symmetric Hyperelliptic Riemann Surfaces *}, journal = {CUBO, A Mathematical Journal}, volume = {12}, year = {2010}, language = {en}, url = {http://dml.mathdoc.fr/item/1435} }
Hidalgo, Rub´en A. A Short Note On 𝑀-Symmetric Hyperelliptic Riemann Surfaces *. CUBO, A Mathematical Journal, Tome 12 (2010) . http://gdmltest.u-ga.fr/item/1435/