D. Ferigollo, V. R. Kirsten, D. Heckler, O. A. T. Figueredo, J. Perez-Cassarino, and R. M. Triches, “Products purchased from family farming for school meals in the cities of Rio Grande do Sul”, Rev. saúde pública, vol. 51, p. 6, Jan. 2017, doi: 10.1590/s1518-8787.2017051006648.