Semi-primal clusters
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 24 (1970) no. 4, pp. 689-701.
@article{ASNSP_1970_3_24_4_689_0,
     author = {Samuelson, D. James},
     title = {Semi-primal clusters},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {689--701},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 24},
     number = {4},
     year = {1970},
     zbl = {0215.34403},
     mrnumber = {281678},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1970_3_24_4_689_0/}
}
Samuelson, D. James. Semi-primal clusters. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 24 (1970) no. 4, pp. 689-701. http://www.numdam.org/item/ASNSP_1970_3_24_4_689_0/

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