ODINTSOV, Sergei P., SKURT, Daniel and WANSING, Heinrich. On Definability of Connectives and Modal Logics over FDE. Logic and Logical Philosophy. Online. 11 April 2019. Vol. 28, no. 4, pp. 631-659. [Accessed 16 August 2024]. DOI 10.12775/LLP.2019.010.