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	1.	Congruence classes in universal algebra/ Ivan Chajda, Gunther Eigenthaler, Helmut Langer. by Chajda, Ivan Eigenthaler, G Länger, Helmut Series: Research and exposition in mathematics ; 26. Publication details: Lemgo, Germany: Heldermann, 2003 Availability: Items available for loan: Castorina (1)Call number: 512 C435c 2012 IMPA. Found in Open Library: Place hold Add to cart (remove)
	2.	Directoids: an algebraic approach to ordered sets/ Ivan Chajda, Helmut Langer. by Chajda, Ivan Länger, Helmut Series: Research and exposition in mathematics ; 32. Publication details: Lemgo, Germany: Heldermann Verlag, 2011 Availability: Items available for loan: Castorina (1)Call number: 511.332 C435d 2011 IMPA. Found in Open Library: Place hold Add to cart (remove)

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