@inproceedings{inproceedings5d16ebc4,
title   = {A β-function that is not a sum of rank functions of matroids},
author = {Murty, U. S. R and Simon, Imre},
year = {1978},
publisher = {Èditions du Centre national de la recherche scientifique},
booktitle   = {[Colloque tenu à l'Université d']Orsay}
}