Are biogenic emissions a significant source of summertime atmospheric toluene in the rural Northeastern United States? - White, M. L.; Russo, R. S.; Zhou, Y.; Ambrose, J. L.; Haase, K.; Frinak, E. K.; Varner, R. K.; Wingenter, O. W.; Mao, H.; Talbot, R.; Sive, B. C. (Atmos. Chem. Phys., 2009)