MathSciNet bibliographic data MR1093592 (93i:20023) 20D60 (20D15) Berkovich, Yakov G. On the number of solutions of the equation \$x\sp {p\sp k}=a\$$x\sp {p\sp k}=a$ in a finite \$p\$$p$-group. Proc. Amer. Math. Soc. 116 (1992), no. 3, 585–590. Article

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