CRAIG, Andrew, P. K. - DAVEY, Brian A. - HAVIAR, Miroslav. Expanding Belnap 2: the dual category in depth. In Categories and General Algebraic Structures with Applications. - Teherán : Shahid Beheshti University, 2022. ISSN 2345-5853, 2022, vol. 17, no 1, pp. 47-83. Dostupné na: https://doi.org/10.52547/cgasa.17.1.47.