@article{urn:eudml:doc:43882, title = {Characterization of all order relations in direct sums of ordered groups.}, journal = {Collectanea Mathematica}, volume = {23}, year = {1972}, pages = {85-90}, zbl = {0275.06020}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:43882} }
Pilz, Günter F. Characterization of all order relations in direct sums of ordered groups.. Collectanea Mathematica, Tome 23 (1972) pp. 85-90. http://gdmltest.u-ga.fr/item/urn:eudml:doc:43882/