Ionic adsorption of ammonium and nitrate on some animal litters and their role in ammonia volatilization. Laboratory results Herman Nimenya, Annie Delaunois, Serge Bloden, Duc La Duong, Bernard Canart, Pascal Gustin, Baudouin Nicks and Michel Ansay Ann. Zootech., 49 2 (2000) 129-140 DOI: 10.1051/animres:2000113