1. R. J. ADAMS (1978 ). Meteorological aspects of changes in spraying techniques .Proceedings British Crop Protection Conference- Weeds, pp.625 -632 .
2. ANON. (1978 ).Controlled drop application. Monograph British Crop Protection Council, No. 22.
3. Field experiments with controlled drop applications of herbicides for the control of dicotyledonous weeds
4. Surfactants and the uptake and movement of paraquat in plants
5. J. B. BYASS, and D. C. LAWRENCE (1976 ). The scope for the use of controlled drop application (CDA) on large cereal-growing farms .Proceedings British Crop Protection Conference - Weeds, pp.363 -368 .