@article{10_4153_CMB_1969_112_6,
     author = {Higgs, Denis},
     title = {Equicardinality of {Bases} in {B-Matroids}},
     journal = {Canadian mathematical bulletin},
     pages = {861--862},
     year = {1969},
     volume = {12},
     number = {6},
     doi = {10.4153/CMB-1969-112-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-112-6/}
}