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BLANCO, José Miguel. EF4, EF4-M and EF4-Ł: A companion to BN4 and two modal four-valued systems without strong Łukasiewicz-type modal paradoxes. Logic and Logical Philosophy. Online. 14 August 2021. Vol. 31, no. 1, pp. 75-104. [Accessed 28 May 2024]. DOI 10.12775/LLP.2021.010.