This report (in two parts) covers two projects, one on sweet potato viruses and one on cassava brown streak disease. They were linked through both being whitefly-transmitted viruses of root crops.
Gibson, R.; Fenby, N.; Seal, S.; Monger, W.; Foster, G. Part I: Identification, characterisation and epidemiological significance of the whitefly-borne component of sweet potato virus disease in Africa. Part II:Molecular characterisation of cassava brown streak virus. Final Technical Report. (1999) 79 pp.