Westgarth-Smith, Angus and Leroy, S.A.G. and Collins, P.E.F. and Harrington, R. (2007) Temporal variations in English populations of a forest insect pest, the green spruce aphid (Elatobium abietinum), associated with the North Atlantic Oscillation and global warming. Quaternary International 173-4 , pp. 153-160. ISSN 1040-6182.