Ruth Barcan Marcus


, 1985, 'Possibiha and possible worlds', Grazer Philosophische Studien 25, 107-133.

, 1981a, Modal logic, modal semantics and their applications, in G. Fløistad & G. H. Von Wright (eds.), Philosophie du langage, logique philosophique / Philosophy of language, philosophical logic, Dordrecht, Springer, pp. 279-298.