García-González, Maria Cruz, Matias B. Vanotti, and Ariel A. Szogi. “ Recovery of Ammonia from Anaerobically Digested Manure Using Gas-Permeable Membranes ”. Scientia Agricola 73, no. 5 (October 1, 2016): 434-438. Accessed January 21, 2021. http://www.revistas.usp.br/sa/article/view/119296.