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Sankappanavar, H. P. Expansions of semi-Heyting algebras. I: Discriminator varieties. (English) Zbl 1254.06006 Stud. Log. 98, No. 1-2, 27-81 (2011). Reviewer: Lavinia Ciungu (Craiova) MSC: 06D20 03G25 08B26 PDFBibTeX XMLCite \textit{H. P. Sankappanavar}, Stud. Log. 98, No. 1--2, 27--81 (2011; Zbl 1254.06006) Full Text: DOI
Loureiro, Isabel Finitely generated free tetravalent modal algebras. (English) Zbl 0523.03055 Discrete Math. 46, 41-48 (1983). MSC: 03G25 03C05 03B45 03G20 08A99 PDFBibTeX XMLCite \textit{I. Loureiro}, Discrete Math. 46, 41--48 (1983; Zbl 0523.03055) Full Text: DOI