@misc{ram-sax-95-budget,
  author = {Lyle Ramshaw and James B. Saxe},
  title = {From Quadrangular Sets to the Budget Matroids},
  year = 1995,
  url = {http://citeseer.nj.nec.com/article/ramshaw95from.html},
  comment = {Uses oriented projective geometry.},
  altkeys = {Citeseer:ramshaw-from}
}