@article{JAC_2009__30_1_a3,
     author = {Derksen, Harm},
     title = {Symmetric and quasi-symmetric functions associated to polymatroids},
     journal = {Journal of Algebraic Combinatorics},
     pages = {43--86},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2009__30_1_a3/}
}