@article{article03bb7cdc,
title   = {Why coalitions?: Party system fragmentation, small party bias, and preferential vote in Brazil},
author = {Calvo, Ernesto and Guarnieri, Fernando and Limongi, Fernando},
year = {2015},
doi = {10.1016/j.electstud.2015.03.012},
journal   = {Electoral Studies}
}