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 pages        = "61--69",
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 year         = "2003",
 title        = "Spin Model Checker, the: Primer and Reference Manual",
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 author       = "I. Rodrigues R. Vieira C.T. dos Santos, P. Quaresma",
 year         = "2006",
 title        = "A Multi-Agent Approach to Question Answering",
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 publisher    = "Springer",
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