Ježek, J. On categories of structures and classes of algebras. (English) Zbl 0209.04401 Diss. Math. 75, 30 p. (1970). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document MSC: 18B99 Special categories 08B99 Varieties PDFBibTeX XML