Krol, M. C., Lelieveld, J., Oram, D. E., Sturrock, G. A., Penkett, S. A., Brenninkmeijer, C. A. M., Gros, V., Williams, J., & Scheeren, H. A. (2003). Continuing emissions of methyl chloroform from Europe. Nature, 421(6919), 131-136.