Geodesic
The problem of the power conjugacy words in a~tree product of free groups with cyclic amalgamation
Fundamentalʹnaâ i prikladnaâ matematika, Tome 22 (2019) no. 4, pp. 29-37

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We give a positive answer to the problem of power conjugacy words in a tree product of free groups with cyclic amalgamation. It is a generalization of the well-known result obtained by S. Lipschutz for a free product of two free groups with cyclic amalgamation. 
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     author = {V. N. Bezverkhnii and E. S. Logacheva},
     title = {The problem of the power conjugacy words in a~tree product of free groups with cyclic amalgamation},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2019_22_4_a2/}
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V. N. Bezverkhnii; E. S. Logacheva. The problem of the power conjugacy words in a~tree product of free groups with cyclic amalgamation. Fundamentalʹnaâ i prikladnaâ matematika, Tome 22 (2019) no. 4, pp. 29-37. http://geodesic.mathdoc.fr/item/FPM_2019_22_4_a2/