Ruch Filozoficzny 5:170–171. English translation: "On three-valued logic", in L. Borkowski (ed. ), Selected works by Jan Łukasiewicz, North–Holland, Amsterdam, 1970, pp.
Ruch Filozoficzny 5:170–171. The English translation of "On three-valued logic" is included in L. Borkowski (ed.), Selected works by Jan Łukasiewicz, North-Holland, Amsterdam, 1970, pp.