Masao Ohnishi and Kazuo Matsumoto. Gentzen method in modal calculi. Osaka mathematical journal, vol. 9 no. 2 (1957), pp. 113–130. See Correction, Masao Ohnishi and Kazuo Matsumoto. Gentzen method in modal calculi. Osaka mathematical journal, vol. 10 (1958), p. 147.
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