@article{JAC_2002__16_3_a2,
     author = {Herzog, J\"urgen and Hibi, Takayuki},
     title = {Discrete polymatroids},
     journal = {Journal of Algebraic Combinatorics},
     pages = {239--268},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2002__16_3_a2/}
}