MathSciNet bibliographic data MR560490 (81d:03022) 03B45 Ursini, Aldo A modal calculus analogous to ${\rm K}4{\rm W}$${\rm K}4{\rm W}$, based on intuitionistic propositional logic. I. Studia Logica 38 (1979), no. 3, 297–311. Article

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