Johnston G (1995) <br />The study of interactive effects of pollutants: a biomarker approach.<br /><i>Sci Tot Environ</i> <b>171</b>: 205<br /><br />Johnston G, Walker CH, Dawson A (1994) <br />Potentiation of Carbaryl Toxicity to the Hybrid Red-Legged Partridge Following Exposure to Malathion<br /><i>Pesticide Biochemistry and Physiology</i> <b>49</b>: 198<br /><br />Walker CH, Brealey CJ, Mackness MI, Johnston G (1991) <br />Toxicity of pesticides to birds; the enzymic factor<br /><i>Biochemical Society Transactions</i> <b>19</b>: 741<br /><br />