1. L. Burgaud, B. Delahousse, J. Deloraine, M. Guillot, M. Riottot, and R. J. Cole(1974 ). Herbicidal activity and the prospects of use of 23,465 RP, a new herbicide in the group of ureidophenyloxadiazolones .Proceedings of the 12th British Weed Control Conference, pp.801 -808 .
2. The time of the onset of competition between wild oats (Avena fatua L.) and spring cereal
3. L. Chiarappa) (1971 ). FAO Manual .Crop loss assessment methods.Serial Nos 61, 64, 65, 96. Commonwealth Agricultural Bureau, Farnham Royal.