Aceto, Luca, Anna Ingólfsdóttir, Mikkel Lykke Pedersen, and Jan Poulsen. “Characteristic Formulae for Timed Automata”. BRICS Report Series 7, no. 23 (January 23, 2000). Accessed February 29, 2024. https://tidsskrift.dk/brics/article/view/20150.