Malema, Mokaba Shirley, Jean-Marc Mwenge Kahinda, Akebe Luther King Abia, Roman Tandlich, Bongumusa M. Zuma, and Eunice Ubomba-Jaswa. 2019. “The Efficiency of a Low-Cost Hydrogen Sulphide (H2S) Kit As an Early Warning Test for Assessing Microbial Rainwater Quality and Its Correlation With Standard Indicators Microorganisms”. Nova Biotechnologica Et Chimica 18 (2):133–143. https://doi.org/10.2478/nbec-2019-0016.