MathSciNet bibliographic data MR2367087 08A30 (06B20 08B99) Lipparini, Paolo Every $m$$m$-permutable variety satisfies the congruence identity $\alpha\beta_h=\alpha\gamma_h$$\alpha\beta_h=\alpha\gamma_h$. Proc. Amer. Math. Soc. 136 (2008), no. 4, 1137–1144. Article

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