[1] DILWORTH R. P. M. WARD: Residuated lattices. Trans. Amer. Soc. 45 (1939), 335-354. MR 1501995

[2] GOGUEN J. A.: $L$-fuzzy sets. J. Math. Anal. Appl. 18 (1967), 145-174. MR 0224391 | Zbl 0145.24404

[3] GOGUEN J. A.: The logic of inexact concepts. Synthese 19 (1968/69), 325-373.

[4] HAUSDORFF F.: Grundzüge der Mengenlehre. Leipzig 1914.

[5] HERRLICH H.: Topological structures. Math. Centre Tracts 52 (1974), 59-122. MR 0358706 | Zbl 0311.54003

[6] ŁUKASIEWICZ J.: Selected works. Studies in Logic and Foundations of Mathematics, North-Hollad Publ. Comp., Amsterdam, and PWN, Warszawa, 1970. MR 0294080

[7] PAVELKA J.: On $L$-fuzzy semantics. Weiterbildungszentrum für Kybernetik u. Rechentechnik, TU Dresden, Heft 21 (1977), 12-25. MR 0485343

[8] PAVELKA J.: On Fuzzy Logic I, II, III. Zeitschrift f. math. Logic u. Grundl. d. Math. Bd. 25 (1979), 45-52, 119-134, 447-464. MR 0524558

[9] PULTR A.: Closed Categories of $L$-Fuzzy Sets. Weiterbildungszentrum f. math. Kybernetik u. Rechentechnik, TU Dresden, Heft 16 (1976), 60-68.

[10] ZADEH L. A.: Fuzzy sets. Information and Control 8 (1965), 338-353. MR 0219427 | Zbl 0139.24606