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Author: Mattila, Jorma K.

• Mattila, Jorma K.: Letter to the editor: Consistency of LPC+Ch. (English). Kybernetika, vol. 34 (1998), issue 2, pp. [235]-237
• Mattila, Jorma K.: Modified modus ponens and modal logic. (English). Kybernetika, vol. 28 (1992), issue 7, pp. 28-32