1. Rush, C.M., McClung, C.M., Lyda, S.D.: Cellular effects of anhydrous ammonia on Phymatotrichum omnivorum Seclerotia. Phytopathology 69, 1044 (1979)
2. Lebuhn, M., Munk, B., Effenberger, M.: Agricultural biogas production in Germany—from practice to microbiology basics. Energy Sustain. Soc. 4, 10 (2014)
3. Gajurel, O.P., van Nes, W.J., Neupane, B.: Survey 1990–91 on GGC Biogas Plants. Gobar Gas Company Research Unit, Butwal (1994)
4. Bernard, G.S.L.: Summary and Recommendations, Report Biogas Survey 1992: Cross Section Analysis of Biogas Dissemination Programmes. BORDA (Bremen Overseas Research and Development), Bremen (1993)
5. Liu, C., Yuan, X.Z., Zeng, G.M., Li, W.W., Li, J.: Prediction of methane yield at optimum pH for anaerobic digestion of organic fraction of municipal solid waste. Bioresour. Technol. 99, 882–888 (2007)