Eckford, R. E., et al. “Thermophilic Anaerobic Digestion of Cattle Manure Reduces Seed Viability for Four Weed Species”. International Journal of Agricultural and Biological Engineering, vol. 5, no. 1, Mar. 2012, pp. 71-75, https://www.ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/567.