@incollection{AST_1976__40__143_0,
     author = {Michel, Pierre},
     title = {Minimal sets generated by a substitution of non constant length},
     booktitle = {International conference on dynamical systems in mathematical physics},
     series = {Ast\'erisque},
     pages = {143--146},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {40},
     year = {1976},
     mrnumber = {453979},
     zbl = {0356.54044},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1976__40__143_0/}
}