C. Walla

The optimal size for biogas plants

Christoph Walla, C. Walla, W. Schneeberger, 2008 .

Farm biogas plants in Austria - an economic analysis.

C. Walla, W. Schneeberger, 2003 .

Energy crop production on organic farms without livestock.

C. Walla, W. Schneeberger, 2006 .