@article{CRMATH_2010__348_9-10_503_0,
     author = {Labourie, Fran\c{c}ois},
     title = {An algebra of observables for cross ratios},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {503--507},
     publisher = {Elsevier},
     volume = {348},
     number = {9-10},
     year = {2010},
     doi = {10.1016/j.crma.2010.03.012},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2010.03.012/}
}