We consider relational periods, where the relation is a compatibility relation on words induced by a relation on letters. We prove a variant of the theorem of Fine and Wilf for a (pure) period and a relational period.
@article{ITA_2009__43_2_209_0, author = {Halava, Vesa and Harju, Tero and K\"arki, Tomi}, title = {The theorem of Fine and Wilf for relational periods}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {43}, year = {2009}, pages = {209-220}, doi = {10.1051/ita:2008025}, mrnumber = {2512255}, zbl = {1166.68035}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_2009__43_2_209_0} }
Halava, Vesa; Harju, Tero; Kärki, Tomi. The theorem of Fine and Wilf for relational periods. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 43 (2009) pp. 209-220. doi : 10.1051/ita:2008025. http://gdmltest.u-ga.fr/item/ITA_2009__43_2_209_0/
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