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Krishnendu Chatterjee, Rasmus Ibsen-Jensen, Andreas Pavlogiannis, Prateesh Goyal. "Faster Algorithms for Algebraic Path Properties in Recursive State Machines with Constant Treewidth." Proceedings of the 42nd Annual ACM SIGPLAN-SIGACT Symposium on Principles of Programming Languages - POPL '15 (2015) 97-109