The odd-even invariant of an oriented matroid

Jim Lawrence. The odd-even invariant of an oriented matroid. Eur. J. Comb., 27(6):806-813, 2006. [doi]

@article{Lawrence06,
  title = {The odd-even invariant of an oriented matroid},
  author = {Jim Lawrence},
  year = {2006},
  doi = {10.1016/j.ejc.2005.05.006},
  url = {http://dx.doi.org/10.1016/j.ejc.2005.05.006},
  researchr = {https://researchr.org/publication/Lawrence06},
  cites = {0},
  citedby = {0},
  journal = {Eur. J. Comb.},
  volume = {27},
  number = {6},
  pages = {806-813},
}