Günther, J., and R. Jiménez-Montealegre. “Effect of the Probiotic <i>Bacillus subtilis</i> on the Growth and Food Utilization of Tilapia (<i>Oreochromis niloticus</i>) and Prawn (<i>Macrobrachium rosenbergii</i≫) under Laboratory Conditions”. Revista De Biología Tropical, vol. 52, no. 4, Dec. 2004, pp. 937–943, https://revistas.ucr.ac.cr/index.php/rbt/article/view/15588.