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@article{JRAM_1981__321_152316, author = {Robert Shelton}, title = {Aperiodic words on three symbols.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {195--209}, publisher = {mathdoc}, volume = {321}, year = {1981}, zbl = {0441.05007}, url = {http://geodesic.mathdoc.fr/item/JRAM_1981__321_152316/} }
Robert Shelton. Aperiodic words on three symbols.. Journal für die reine und angewandte Mathematik, Tome 321 (1981), pp. 195-209. http://geodesic.mathdoc.fr/item/JRAM_1981__321_152316/