@article{fagundez_xavier_medronho_facó_xavier_2009,  title={A study on the universal access to vaccines in Brazil},  volume={29},  ISSN={0101-7438},  url={https://doi.org/10.1590/S0101-74382009000300008},  DOI={10.1590/S0101-74382009000300008},  number={3},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Fagundez, Fabio Dias and Xavier, Adilson Elias and Medronho, Roberto de Andrade and Facó, João Lauro Dorneles and Xavier, Leandro Layter},  year={2009},  month={Sep},  pages={591–603} }