Geodesic
Homomorphic images of finite subdirectly irreducible unary algebras
Czechoslovak Mathematical Journal, Tome 57 (2007) no. 2, pp. 671-677.

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We prove that a finite unary algebra with at least two operation symbols is a homomorphic image of a (finite) subdirectly irreducible algebra if and only if the intersection of all its subalgebras which have at least two elements is nonempty.
Classification : 08A60, 08B26
Keywords: subdirectly irreducible unary algebra 
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     author = {Je\v{z}ek, J. and Markovi\'c, P. and Stanovsk\'y, D.},
     title = {Homomorphic images of finite subdirectly irreducible unary algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {671--677},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {2007},
     mrnumber = {2337621},
     zbl = {1174.08304},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2007__57_2_a9/}
}
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Ježek, J.; Marković, P.; Stanovský, D. Homomorphic images of finite subdirectly irreducible unary algebras. Czechoslovak Mathematical Journal, Tome 57 (2007) no. 2, pp. 671-677. http://geodesic.mathdoc.fr/item/CMJ_2007__57_2_a9/