M. E. Silva and  I. Brás,  Valorization of Beer Brewing Wastes by Composting.   journal   = {International Journal of Biotechnology and Bioengineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 123(3). 232 - 235
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10006597.