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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     author = {Rota, Gian-Carlo and Smith, David A.},
     title = {Enumeration under group action},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {637--646},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 4},
     number = {4},
     year = {1977},
     mrnumber = {498171},
     zbl = {0367.05008},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1977_4_4_4_637_0/}
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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://www.numdam.org/item/ASNSP_1977_4_4_4_637_0/

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