M. A. Teixeira, P. H. Nascimento Saldiva, N. L. de Souza, I. L. Sinhorini, and J. L. B. Merusse, “Reduction of atmospheric ammonia (NH3) and incidence of pulmonary lesions in mice kept in plenum chamber microenvironmental ventilation system”, Scand J Lab Anim Sci, vol. 28, no. 3, Dec. 2001.