1. Baldwin, B. C., A. D. Dodge and N. Harris, Recent advances in studies of the mode of action of the bipyridilium herbicides. Proc. Brit. Weed Control Conf. 9, 639 (1968).
2. Barnes, J. M., Poisions that hit and run. New Scientist 38, 619 (1968).
3. Beebeejaun, A. R., G. Beevers and W. N. Rogers, Paraquat poisoning prolonged excretion. Clin. Toxicol, 4, 397 (1971).
4. Bronkhorst, F. B., J. M. van Daal and H. D. Tan, Dodelijk verlopende intoxicatie door paraquat (Gramoxone). Ned. T. Geneesk. 112, 310 (1968).
5. Bullivant, C. M., Accidental poisoning by paraquat: report of two cases in man. Brit. med. J. 1966/1, 1272.