J. I. P. da Rocha, M. C. P. da Rocha, S. C. Almeida, B. L. Ramos, and A. C. B. Mrozinsk, “Relationship between asthma occurrence in children and the educational level of their caregivers, family income and housing conditions”, Rev. Fac. Ciênc. Méd. Sorocaba, vol. 13, no. 1, pp. 17–21, Mar. 2011.