no. 1
On certain classes of - and an existence theorem for - primal clusters
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 20 (1966) no. 1, pp. 1-13. 
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     author = {Yaqub, Adil},
     title = {On certain classes of - and an existence theorem for - primal clusters},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {1--13},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 20},
     number = {1},
     year = {1966},
     zbl = {0163.26601},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1966_3_20_1_1_0/}
}
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Yaqub, Adil. On certain classes of - and an existence theorem for - primal clusters. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 20 (1966) no. 1, pp. 1-13. http://archive.numdam.org/item/ASNSP_1966_3_20_1_1_0/

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6 A. Yaqub, Primal clusters, Pacific J. Math. (in press). | MR | Zbl