@article{JEMS_2017_19_3_a3,
     author = {Federico Ardila and Felipe Rinc\'on and Lauren K. Williams},
     title = {Positively oriented matroids are realizable},
     journal = {Journal of the European Mathematical Society},
     pages = {815--833},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {2017},
     doi = {10.4171/jems/680},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/680/}
}