no. 4
Enumeration under group action
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 4, pp. 637-646. 
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     title = {Enumeration under group action},
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Rota, Gian-Carlo; Smith, David A. Enumeration under group action. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 4, pp. 637-646. http://archive.numdam.org/item/ASNSP_1977_4_4_4_637_0/

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