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R. Langer, Symmetric Functions and Macdonald, arXiv:0907.3950v2 [math.CO] 3 Sep 2009.
M. A. M¨Śndez, Species on digraphs, Adv Math., 123 (1996) 243-275.
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T. Yoshida, Categorical aspects of generating functions (I): Exponential formulas and Krull-Schmidt categories, J. Algebra, 240 (2001) 40-82.
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