no. 1
The decidability of the equivalence problem for polynomially bounded DOL sequences
RAIRO. Informatique théorique, Tome 11 (1977) no. 1, pp. 17-28. 
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     title = {The decidability of the equivalence problem for polynomially bounded {DOL} sequences},
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     pages = {17--28},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {1},
     year = {1977},
     mrnumber = {464724},
     zbl = {0359.68086},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1977__11_1_17_0/}
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Karhumäki, Juhani. The decidability of the equivalence problem for polynomially bounded DOL sequences. RAIRO. Informatique théorique, Tome 11 (1977) no. 1, pp. 17-28. http://archive.numdam.org/item/ITA_1977__11_1_17_0/

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2. A. Ehrenfeucht and G. Rozenberg, DOL-Systems with Rank, Lecture Notes in Computer Science, Springer, Vol. 15, 1974, pp. 136-141. | MR | Zbl

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7. Problem book. Unusual Automata Theory, January 1972, Dept. of Computer Science, Univ. of Aarhus, Tech. Report DAIMI PB-15, 1973, pp. 14-26.

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