Dynamic semantics and circular propositions. - Willem Groeneveld (J. Philos. Log., 1994)

An Update on ??Might?? - Jaap van der Does; Willem Groeneveld; Frank Veltman (J. Log. Lang. Inf., 1997)

Reasoning about Information Change. - Jelle Gerbrandy; Willem Groeneveld (J. Log. Lang. Inf., 1997)