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Subdirectly irreducible groupoids in some varieties Jerzy Płonka (1983) Commentationes Mathematicae Universitatis Carolinae
Subdirectly irreducible non-idempotent left symmetric left distributive groupoids Emil Jeřábek, Tomáš Kepka, David Stanovský (2005) Discussiones Mathematicae - General Algebra and Applications We study groupoids satisfying the identities x·xy = y and x·yz = xy·xz. Particularly, we focus our attention at subdirectlyirreducible ones, find a description and charecterize small ones.
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Subgroups normalized by the commutator subgroup of the Levi subgroup. Kazakevich, V.G., Stavrova, A.K. (2004) Zapiski Nauchnykh Seminarov POMI
Subgroups of a finite group whose algebra of invariants is a complete intersection Н.Л. Гордеев (1982) Zapiski naucnych seminarov Leningradskogo
Subgroups of finite index in generalized T -groups Carlo Casolo (1988) Rendiconti del Seminario Matematico della Università di Padova
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