1. Discrete tense logic with beginning and ending time: An infinite hierarchy of complete axiomatic systems;Åqvist;Logique Anal.,1991
2. Systematic frame constants in defeasible deontic logic: A new form of Andersonian reduction;Åqvist,1997
3. The logic of historical necessity as founded on two-dimensional modal tense logic;Åqvist;J. Philos. Logic,1999
4. Three characterizability problems in deontic logic;Åqvist;Nordic J. Philos. Logic,2000
5. Conditionality and branching time in deontic logic: Further remarks on the Alchourrón & Bulygin example;Åqvist,2002