David Harel. Dynamic logic. Handbook of philosophical logic, Volume II, Extensions of classical logic, edited by D. Gabbay and F. Guenthner, Synthese library, vol. 165, D. Reidel Publishing Company, Dordrecht, Boston, and Lancaster, 1984., pp. 497–604.
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1989 ◽
Vol 54
(4)
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pp. 1472-1477
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