Michael Butler, Issam Maamria. Practical Theory Extension in Event-B. In Zhiming Liu, Jim Woodcock, Huibiao Zhu, editors, Theories of Programming and Formal Methods - Essays Dedicated to Jifeng He on the Occasion of His 70th Birthday. Volume 8051 of Lecture Notes in Computer Science, pages 67-81, Springer, 2013. [doi]
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