Galvão L C, Guedes C M, Rodrigues M A M, Silva S R, Valentim R C, Moreira O C, Ribeiro J R and Sequeira C A 2008: Prediction of apparent digestibility of hays from natural pastures of the Northeast region of Portugal. Volume 20, Article #124. Retrieved
, from http://www.lrrd.org/lrrd20/8/galv20124.htm