Mokhele Edmond Moeletsi, Zakhele Phumlani Shabalala, Gert De Nysschen, and Sue Walker, “Evaluation of an inverse distance weighting method for patching daily and dekadal rainfall over the Free State Province, South Africa”, WSA, vol. 42, no. 3 July, Jul. 2016, doi: 10.4314/wsa.v42i3.12.