Oberschelp, Walter Monotonicity for structure numbers in theories without identity. (English) Zbl 0365.02038 Comb. Represent. Groupe symetr., Actes Table Ronde C. N. R. S. Strasbourg 1976, Lect. Notes Math. 579, 297-308 (1977). MSC: 03C68 PDFBibTeX XML
Oberschelp, Walter Kombinatorische Probleme in der Logik. (German) Zbl 0199.00202 Studium generale 19, 508-516 (1966). MSC: 03-XX PDFBibTeX XML