1. L. Åqvist. Formal semantics for verb tenses as analysed by Reichenbach. In Pragmatics of Language and Literature. T. A. van Dijk, ed. pp. 229–236. North Holland, Amsterdam, 1975.
2. L. Åqvist and F. Guenthner. Fundamentals of a theory of verb aspect and events within the setting of an improved tense logic. In Studies in Formal Semantics. F. Guenthner and C. Rohrer, eds. pp. 167–20. North Holland, Amsterdam, 1978.
3. L. Aqvist and F. Guenthner, eds. Tense logic (= Logique et Analyse, 80), 1977.
4. R. A. Bull. An algebraic study of tense logic with linear time. Journal of Symbolic Logic, 33, 27–38, 1968.
5. R. A. Bull. An approach to tense logic.Theorza,
36, 1978.