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/