@article{GDZPPN002392070, title = {Systems of ideals in partially ordered semigroups.}, journal = {Mathematische Zeitschrift}, volume = {78}, year = {1962}, pages = {439-450}, zbl = {0123.01804}, url = {http://dml.mathdoc.fr/item/GDZPPN002392070} }
Burgess, D.C.J.; McFadden, R. Systems of ideals in partially ordered semigroups.. Mathematische Zeitschrift, Tome 78 (1962) pp. 439-450. http://gdmltest.u-ga.fr/item/GDZPPN002392070/