TKACZYK, Marcin and JARMUŻEK, Tomasz. Jerzy Łoś Positional Calculus and the Origin of Temporal Logic. Logic and Logical Philosophy. Online. 23 September 2018. Vol. 28, no. 2, pp. 259-276. [Accessed 17 July 2024]. DOI 10.12775/LLP.2018.013.