@article{106261,
author = {Jerzy P\l onka},
title = {Subdirectly irreducible groupoids in some varieties},
journal = {Commentationes Mathematicae Universitatis Carolinae},
volume = {024},
year = {1983},
pages = {631-645},
zbl = {0543.08007},
mrnumber = {738559},
language = {en},
url = {http://dml.mathdoc.fr/item/106261}
}
Płonka, Jerzy. Subdirectly irreducible groupoids in some varieties. Commentationes Mathematicae Universitatis Carolinae, Tome 024 (1983) pp. 631-645. http://gdmltest.u-ga.fr/item/106261/
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Subdirectly irreducible algebras with exactly $n$ essentially $n$-ary polynomials, to appear.