%0 Journal Article %A V. L. Usol'tsev %T Free algebras of a~unary variety with Mal'tsev's operation that satisfies the Pixley conditions %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 2009 %P 43-49 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_2009_4_a5/ %G ru %F IVM_2009_4_a5