1. Manure treatment techniques in Europe—result of a EU Concerted Action;Beck,1998
2. Technology assessment—livestock management;Berg;Anim. Res. Dev.,1999
3. Reducing ammonia emissions by combining covering and acidifying liquid manure;Berg,2003
4. Emission reduction by acidification of slurry—investigations and assessment;Berg,1997
5. Reducing emissions by combining slurry covering and acidifying;Berg,2003