www.prismmodelchecker.org
[JHFB20] Simon Jantsch, Hans Harder, Florian Funke and Christel Baier. SWITSS: Computing Small Witnessing Subsystems. In Proc. Formal Methods in Computer Aided Design (FMCAD'20). 2020. [Proposes a tool for computing witnesses in Markov models, with underlying of PRISM for model generation.]
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