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Kitaev, Sergey and Liese, Jeff and Remmel, Jeffrey and Sagan, Bruce (2009) Rationality, irrationality, and Wilf equivalence in generalized factor order. In: 21st International Conference on Formal Power Series & Algebraic Combinatorics, 2009-07-20 - 2009-07-24.
Bousquet-Melou, Mireille and Claesson, Anders and Dukes, Mark and Kitaev, Sergey (2009) Unlabeled (2+2)-free posets, ascent sequences and pattern avoiding permutations. In: 21st International Conference on Formal Power Series & Algebraic Combinatorics, 2009-07-20 - 2009-07-24.