@article{ASNSP_1966_3_20_1_1_0,
     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/}
}