I. R. Kanu and  T. J. Aspray and  A. J. Adeloye,  Understanding and Predicting Foam in Anaerobic Digester.   journal   = {International Journal of Bioengineering and Life Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2015, vol. 106(10). 1129 - 1133
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10002991.