no. 4
On the equality sets for homomorphisms on free monoids with two generators
RAIRO. Informatique théorique, Tome 14 (1980) no. 4, pp. 349-369. 
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     title = {On the equality sets for homomorphisms on free monoids with two generators},
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     pages = {349--369},
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     volume = {14},
     number = {4},
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     mrnumber = {607436},
     zbl = {0454.20048},
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     url = {http://www.numdam.org/item/ITA_1980__14_4_349_0/}
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Culik II, K.; Karhumäki, J. On the equality sets for homomorphisms on free monoids with two generators. RAIRO. Informatique théorique, Tome 14 (1980) no. 4, pp. 349-369. http://www.numdam.org/item/ITA_1980__14_4_349_0/

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