no. 5
The pseudovariety J is hyperdecidable
RAIRO. Informatique théorique et applications, Tome 31 (1997) no. 5, pp. 457-482 
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     pages = {457--482},
     year = {1997},
     publisher = {EDP-Sciences},
     volume = {31},
     number = {5},
     mrnumber = {1611659},
     zbl = {0928.20046},
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     url = {https://www.numdam.org/item/ITA_1997__31_5_457_0/}
}
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Almeida, J.; Zeitoun, M. The pseudovariety $J$ is hyperdecidable. RAIRO. Informatique théorique et applications, Tome 31 (1997) no. 5, pp. 457-482. https://www.numdam.org/item/ITA_1997__31_5_457_0/

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