Pliuškevičius , Regimantas. “Loop-Free Verification of Termination of Derivation for a Fragment of Dynamic Logic”. Lietuvos matematikos rinkinys 48, no. proc. LMS (December 21, 2008): 283–287. Accessed December 31, 2025. https://www.zurnalai.vu.lt/LMR/article/view/18111.