Aceto, Luca, Zoltán Ésik, and Anna Ingólfsdóttir. “Equational Axioms for Probabilistic Bisimilarity (Preliminary Report)”. BRICS Report Series 9, no. 6 (February 5, 2002). Accessed May 29, 2020. https://tidsskrift.dk/brics/article/view/21724.