@article{CRMATH_2003__336_7_549_0,
     author = {Bartholdi, Laurent},
     title = {A {Wilson} group of non-uniformly exponential growth},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {549--554},
     publisher = {Elsevier},
     volume = {336},
     number = {7},
     year = {2003},
     doi = {10.1016/S1631-073X(03)00131-6},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/S1631-073X(03)00131-6/}
}