Ideals and filters
Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 79-86. 
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     author = {Aull, C. E.},
     title = {Ideals and filters},
     journal = {Compositio Mathematica},
     pages = {79--86},
     publisher = {P. Noordhoff N. V., Groningen},
     volume = {18},
     number = {1-2},
     year = {1967},
     mrnumber = {223469},
     zbl = {0189.02103},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1967__18_1-2_79_0/}
}
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Aull, C. E. Ideals and filters. Compositio Mathematica, Tome 18 (1967) no. 1-2, pp. 79-86. http://archive.numdam.org/item/CM_1967__18_1-2_79_0/

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A.H. Clifford and G.B. Preston, [2] The algebraic theory of semigroups, Am. Math. Soc. Surveys, No. 7, 1961. | MR | Zbl

J.L. Kelley, [3] General topology, New York, 1955. | MR | Zbl

N.H. Mccoy, [4] Rings and ideals, Carus Monograph 8, Math. Assoc. of Amer., Buffalo, N. Y. 1948. | MR | Zbl