[1] Chajda I.: Lattices of compatible relations. Arch. Math. (Brno) 13 (1977), 89–96. MR 0463081 | Zbl 0372.08002

[2] Csákány B.: Varieties whose algebras have no idempotent elements. Colloq. Math. 35 (1976), 201–203. MR 0404109

[3] Csákány B.: Proving Magari’s theorem via a Mal’cev-type result. Proceeding of the Summer School of General Algebra and Ordered Sets 1994, Palacký University Olomouc, pp. 31–32.

[4] Duda J.: On two schemes applied to Mal’cev type theorems. Ann. Sci. Budapest 26 (1983), 39–45. MR 0719774 | Zbl 0518.08002

[5] Kollár J.: Congruences and one element subalgebras. Algebra Univ. 9 (1979), 266–267. DOI 10.1007/BF02488038

[6] Quackenbush R. W.: Varieties with $n$-principal compact congruences. Algebra Univ. 14 (1982), 292–296. DOI 10.1007/BF02483933 | Zbl 0493.08006