@article{TSG_1994-1995__13__123_0,
     author = {Cherix, Pierre-Alain},
     title = {Generic result for the existence of a free semi-group},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {123--133},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {13},
     year = {1994-1995},
     mrnumber = {1715961},
     zbl = {0925.20070},
     language = {en},
     url = {http://www.numdam.org/item/TSG_1994-1995__13__123_0/}
}