@article{article1bb6f0f4,
title   = {Euler's relation, möbius functions and matroid identities},
author = {Cordovil, Raul and Las Vergnas, Michel and Mandel, Arnaldo},
year = {1982},
doi = {10.1007/BF00147634},
publisher = {Springer Science and Business Media LLC},
journal   = {Geometriae Dedicata}
}