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"Ryo Kashima,Keishi Okamoto","General models and completeness of first-order modal mu-calculus",,"Journal of Logic and Computation",,"Vol. 18","No. 4","pp. 497-507",2008,Aug.
"Ryo Ishigaki,Ryo Kashima","Sequent calculi for some strict implication logics",,"Logic Journal of the IGPL",,"Vol. 16","No. 2","pp. 155-174",2008,Apr.