Yuba, T.Y. et al. 2013. Evolution of the relative prices of food groups between 1939 and 2010 in the city of Sao Paulo, Southeastern Brazil. Revista de Saúde Pública. 47, 3 (Jun. 2013), 549–559. DOI:https://doi.org/10.1590/rsp.v47i3.76661.