Vallin, Vitória Maria, et al. “Milk Quality Improvement After Implantation of Good Manufacturing Practices in Milking in 19 Cities of the Central Region of Paraná”. Semina: Ciências Agrárias, vol. 30, no. 1, July 2009, pp. 181-8, doi:10.5433/1679-0359.2009v30n1p181.