Geodesic
Formations of finite monounary algebras
Čebyševskij sbornik, Tome 12 (2011) no. 2, pp. 102-109.

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In this paper we characterize the lattice of subformations of an arbitrary finite formation of monounary algebras. It is proved that every finite formation of monounary algebras is a hereditary formation. 
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A. L. Rasstrigin. Formations of finite monounary algebras. Čebyševskij sbornik, Tome 12 (2011) no. 2, pp. 102-109. http://geodesic.mathdoc.fr/item/CHEB_2011_12_2_a12/

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