Viljoen, M., Johannsen, E. and Panzer, A. 2005. Probiotics: diet supplements of live, non-pathogenic micro-organisms. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;. 24, 1/2 (Sep. 2005), 2-10. DOI:https://doi.org/10.4102/satnt.v24i1/2.161.