@article{GDZPPN001249711, title = {An equivalency problem in discrete programming over ordered semigroups.}, journal = {Semigroup forum}, volume = {7}, year = {1974}, pages = {69-73}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN001249711} }
Gabovic, E.Ja. An equivalency problem in discrete programming over ordered semigroups.. Semigroup forum, Tome 7 (1974) pp. 69-73. http://gdmltest.u-ga.fr/item/GDZPPN001249711/