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@article{JRAM_1981__327_152381, author = {Robert Shelton}, title = {Aperiodic words on three symbols. {II.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {1--11}, publisher = {mathdoc}, volume = {327}, year = {1981}, zbl = {0455.05014}, url = {http://geodesic.mathdoc.fr/item/JRAM_1981__327_152381/} }
Robert Shelton. Aperiodic words on three symbols. II.. Journal für die reine und angewandte Mathematik, Tome 327 (1981), pp. 1-11. http://geodesic.mathdoc.fr/item/JRAM_1981__327_152381/