Johnston G (1995)
The study of interactive effects of pollutants: a biomarker approach.
Sci Tot Environ 171: 205

Johnston G, Walker CH, Dawson A (1994)
Potentiation of Carbaryl Toxicity to the Hybrid Red-Legged Partridge Following Exposure to Malathion
Pesticide Biochemistry and Physiology 49: 198

Walker CH, Brealey CJ, Mackness MI, Johnston G (1991)
Toxicity of pesticides to birds; the enzymic factor
Biochemical Society Transactions 19: 741