@article {1289, title = {Effects of carbon dioxide and nitrogen enrichment on a plantinsect interaction: the quality of Calluna vulgaris as a host for Operophtera brumata}, journal = {New Phytologist}, volume = {140}, year = {1998}, pages = {43-53}, author = {Kerslake, J.E. and Woodin, S.J. and Hartley, S.E.} }