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\newblock Verification by Abstract Interpretation, Soundness and Abstract Induction.
\newblock In \emph{Proceedings of the 17th International Symposium on Principles and
Practice of Declarative Programming (PPDP 2015)}, Siena, Italy, July 14-16, 2015,
Elvira Albert and Moreno Falaschi (Eds), \textcopy~ACM SIGPLAN, 2015.