Aldo de Luca. On the product of square-free words. Discrete Mathematics, 52(2-3):143-157, 1984. [doi]
@article{Luca84, title = {On the product of square-free words}, author = {Aldo de Luca}, year = {1984}, doi = {10.1016/0012-365X(84)90077-3}, url = {http://dx.doi.org/10.1016/0012-365X(84)90077-3}, researchr = {https://researchr.org/publication/Luca84}, cites = {0}, citedby = {0}, journal = {Discrete Mathematics}, volume = {52}, number = {2-3}, pages = {143-157}, }