%0 Journal Article %A Schaffhauser, Florent %T Representations of the Fundamental Group of an $L$ –Punctured Sphere Generated by Products of Lagrangian Involutions %J Canadian journal of mathematics %D 2007 %P 845-879 %V 59 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2007-036-9/ %R 10.4153/CJM-2007-036-9 %F 10_4153_CJM_2007_036_9