Olivo C J, Beck L I, Mossate Gabbi A, Santini Charão P, Sobczak M F, Gomes Uberty L F, Dürr J W and Araújo Filho R 2005: Composition and somatic cell count of milk in conventional and agro-ecological farms: a comparative study in Depressão Central, Rio Grande do Sul state, Brazil. Livestock Research for Rural Development. Volume 17, Article #72. Retrieved
, from http://www.lrrd.org/lrrd17/6/oliv17072.htm