Geodesic
On heredity of formations of monounary algebras
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 4, pp. 108-113.

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A class of algebraic systems is said to be a formation if it is closed under homomorphic images and finite subdirect products. It has been proven that any formation of at most countable monounary algebras is a hereditary formation. 
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A. L. Rasstrigin. On heredity of formations of monounary algebras. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 4, pp. 108-113. http://geodesic.mathdoc.fr/item/ISU_2013_13_4_a17/

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