Champagne, Claude P., Hélène Gaudreau, and John Conway. 2003. “Effect of the Production or Use of Mixtures of bakers’ or brewers’ Yeast Extracts on Their Ability to Promote Growth of Lactobacilli and Pediococci”. Electronic Journal of Biotechnology 6 (3). Valparaíso, Chile:0-0. https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v6n3-3.