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@article{MZ_1962__79_170080, author = {D.C.J. Burgess and R. McFadden}, title = {Systems of ideals in partially ordered semigroups.}, journal = {Mathematische Zeitschrift}, pages = {439--450}, publisher = {mathdoc}, volume = {79}, year = {1962}, zbl = {0123.01804}, url = {http://geodesic.mathdoc.fr/item/MZ_1962__79_170080/} }
D.C.J. Burgess; R. McFadden. Systems of ideals in partially ordered semigroups.. Mathematische Zeitschrift, Tome 79 (1962), pp. 439-450. http://geodesic.mathdoc.fr/item/MZ_1962__79_170080/