@article{10_1017_S0017089510000753,
     author = {FERRANDO, J. C.},
     title = {bvca(\ensuremath{\Sigma}, {X)} {REVISITED}},
     journal = {Glasgow mathematical journal},
     pages = {341--346},
     year = {2011},
     volume = {53},
     number = {2},
     doi = {10.1017/S0017089510000753},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089510000753/}
}