no. 4
An algorithm for the word problem in HNN extensions and the dependence of its complexity on the group representation
RAIRO. Informatique théorique, Tome 15 (1981) no. 4, pp. 355-371. 
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     author = {Avenhaus, J. and Madlener, K.},
     title = {An algorithm for the word problem in $HNN$ extensions and the dependence of its complexity on the group representation},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {355--371},
     publisher = {EDP-Sciences},
     volume = {15},
     number = {4},
     year = {1981},
     mrnumber = {670729},
     zbl = {0494.20020},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1981__15_4_355_0/}
}
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Avenhaus, J.; Madlener, K. An algorithm for the word problem in $HNN$ extensions and the dependence of its complexity on the group representation. RAIRO. Informatique théorique, Tome 15 (1981) no. 4, pp. 355-371. http://www.numdam.org/item/ITA_1981__15_4_355_0/

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