@article{CRMATH_2008__346_3-4_173_0,
     author = {de Cornulier, Yves and Stalder, Yves and Valette, Alain},
     title = {Proper actions of lamplighter groups associated with free groups},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {173--176},
     publisher = {Elsevier},
     volume = {346},
     number = {3-4},
     year = {2008},
     doi = {10.1016/j.crma.2007.11.027},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2007.11.027/}
}