The word problem and power problem in $1$-relator groups are primitive recursive.
Cannonito, F. B. ; Gatterdam, R. W.
Pacific J. Math., Tome 61 (1975) no. 2, p. 351-359 / Harvested from Project Euclid
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Publié le : 1975-05-14
Classification:  02F47,  20F10,  20E10 
@article{1102868031,
     author = {Cannonito, F. B. and Gatterdam, R. W.},
     title = {The word problem and power problem in $1$-relator groups are primitive recursive.},
     journal = {Pacific J. Math.},
     volume = {61},
     number = {2},
     year = {1975},
     pages = { 351-359},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102868031}
}

Cannonito, F. B.; Gatterdam, R. W. The word problem and power problem in $1$-relator groups are primitive recursive.. Pacific J. Math., Tome 61 (1975) no. 2, pp.  351-359. http://gdmltest.u-ga.fr/item/1102868031/