@article{SLC_1989_22_a2,
     author = {Andreas W. M. Dress and Walter Wenzel},
     title = {Valuated {Matroids} - {A} new {Look} at the {Greedy} {Algorithm}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {22},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/SLC_1989_22_a2/}
}