Notholt, J., Luo, B. P., Fueglistaler, S., Weisenstein, D., Rex, M., Lawrence, M. G., Bingemer, H., Wohltmann, I., Corti, T., Warneke, T., von Kuhlmann, R., & Peter, T. (2005). Influence of tropospheric SO2 emissions on particle formation and the stratospheric humidity. Geophysical Research Letters, 32(7):. doi:10.1029/2004GL022159.