TY - JOUR AU - Ya. I. Petrukhin TI - Natural deduction systems for the three-valued nonsense logics $\mathbf{Z}$ and $\mathbf{E}$ JO - Vestnik Moskovskogo universiteta. Matematika, mehanika PY - 2018 SP - 60 EP - 63 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VMUMM_2018_1_a8/ LA - ru ID - VMUMM_2018_1_a8 ER -