Celeste, Roger Keller, and Joao Luiz Bastos. “Mid-Point for Open-Ended Income Category and the Effect of Equivalence Scales on the Income-Health Relationship”. Revista De Saúde Pública, vol. 47, no. supl. 3, Dec. 2013, pp. 168-74, https://doi.org/10.1590/rsp.v47isuppl.3.76766.