@article{10_4153_CJM_2007_036_9,
     author = {Schaffhauser, Florent},
     title = {Representations of the {Fundamental} {Group} of an $L$ {{\textendash}Punctured} {Sphere} {Generated} by {Products} of {Lagrangian} {Involutions}},
     journal = {Canadian journal of mathematics},
     pages = {845--879},
     year = {2007},
     volume = {59},
     number = {4},
     doi = {10.4153/CJM-2007-036-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2007-036-9/}
}