1. Adamson, P.T.A., 1987. South African rainfall data base. Dept. of Water Affairs, Pretoria, TR133.
2. Atkinson, A.C., 1985. Plots, Transformations & Regression. Clarendon, Oxford.
3. Gordon, A.D., 1981. Classification. Chapman & Hall.
4. Makhuvha, T., 1988. The estimation of missing values in hydrological records using the EM algorithm and regression methods. Unpublished M.Sc. Thesis, University of Cape Town.
5. Makhuvha, T., Pegram, G., Sparks, R. and Zucchini, W., 1997a. Patching rainfall data using regression methods. 1. Best subset selection, EM and pseudo-EM methods: theory. J. Hydrol., 289–307.