@article{10_4064_cm_20_2_215_220,
     author = {D. A. Higgs},
     title = {Matroids and duality},
     journal = {Colloquium Mathematicum},
     pages = {215--220},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1969},
     doi = {10.4064/cm-20-2-215-220},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-20-2-215-220/}
}