MathSciNet bibliographic data MR2439405 20E08 (20F65) Brady, N.; Ciobanu, L.; Martino, A.; O Rourke, S. The equation \$x\sp py\sp q=z\sp r\$$x\sp py\sp q=z\sp r$ and groups that act freely on \$\Lambda\$$\Lambda$-trees. Trans. Amer. Math. Soc. 361 (2009), no. 1, 223–236. Article

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