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Recurrence relations and two-dimensional set partitions. Mansour, Toufik, Munagi, Augustine, Shattuck, Mark (2011) Journal of Integer Sequences [electronic only]
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Reducibility as a tool to extend the power of approximation algorithms the minimization of boolean expressions A. Aiello, E. Burattini, A. Massarotti (1977) RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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