Wang Mengjie, Director of China Centre for Rural Energy Research and Training, in 2002 submitted the 4 page article Biogas Technology and Ecological Environment Development IN Rural Areas Of China (PDF Download Here) at the First International Conference on Ecological Sanitation
While not a technical paper, Wang gives some nice support for the use of biogas in China’s rural areas.
Included in this paper was one of the best illustrations of what a courtyard biogas system would look like (see above)