@article{GDZPPN002199122,
title = {Aperiodic words on three symbols. III.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {334},
year = {1982},
pages = {44-52},
zbl = {0467.05010},
url = {http://dml.mathdoc.fr/item/GDZPPN002199122}
}
Shelton, Robert O.; Soni, Raj P. Aperiodic words on three symbols. III.. Journal für die reine und angewandte Mathematik, Tome 334 (1982) pp. 44-52. http://gdmltest.u-ga.fr/item/GDZPPN002199122/