@article{KYB_1992_28_Suppl_a5,
author = {Mattila, Jorma K.},
title = {Modified modus ponens and modal logic},
journal = {Kybernetika},
pages = {28--32},
year = {1992},
volume = {28},
number = {Suppl},
mrnumber = {1226047},
zbl = {0861.03011},
language = {en},
url = {http://geodesic.mathdoc.fr/item/KYB_1992_28_Suppl_a5/}
}
Mattila, Jorma K. Modified modus ponens and modal logic. Kybernetika, Tome 28 (1992), pp. 28-32. http://geodesic.mathdoc.fr/item/KYB_1992_28_Suppl_a5/
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