Minimal sets generated by a substitution of non constant length
International conference on dynamical systems in mathematical physics, Astérisque, no. 40 (1976), 4 p. 
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     author = {Michel, Pierre},
     title = {Minimal sets generated by a substitution of non constant length},
     booktitle = {International conference on dynamical systems in mathematical physics},
     author = {Collectif},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {40},
     year = {1976},
     zbl = {0356.54044},
     mrnumber = {453979},
     language = {en},
     url = {http://www.numdam.org/item/AST_1976__40__143_0/}
}
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Michel, Pierre. Minimal sets generated by a substitution of non constant length, dans International conference on dynamical systems in mathematical physics, Astérisque, no. 40 (1976), 4 p. http://www.numdam.org/item/AST_1976__40__143_0/