Water Research, Volume 115, 15 May 2017, Pages 256–265.
Naresh Devarajan, Thilo Köhler, Periyasamy Sivalingam, Christian van Delden, Crispin K. Mulaji, Pius T. Mpiana, Bastiaan W. Ibelings, John Poté
http://www.sciencedirect.com/science/article/pii/S0043135417301562