no. 1
Independent instances for some undecidable problems
RAIRO. Informatique théorique, Tome 17 (1983) no. 1, pp. 49-54. 
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     author = {Calude, Cristian and P\u{a}un, Gheorghe},
     title = {Independent instances for some undecidable problems},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {49--54},
     publisher = {EDP-Sciences},
     volume = {17},
     number = {1},
     year = {1983},
     mrnumber = {701987},
     zbl = {0517.03022},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1983__17_1_49_0/}
}
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Calude, Cristian; Păun, Gheorghe. Independent instances for some undecidable problems. RAIRO. Informatique théorique, Tome 17 (1983) no. 1, pp. 49-54. http://archive.numdam.org/item/ITA_1983__17_1_49_0/

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