@article{ASNSP_1951_3_5_3-4_279_0,
     author = {Foster, Alfred L.},
     title = {$p$-rings and ring-logics},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {279--300},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 5},
     number = {3-4},
     year = {1951},
     mrnumber = {47625},
     zbl = {0044.26201},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1951_3_5_3-4_279_0/}
}