Kunhikrishnan, T., Lawrence, M. G., von Kuhlmann, R., Richter, A., Ladstätter-Weißenmayer, A., & Burrows, J. P. (2004). Semiannual NO2 plumes during the monsoon transition periods over the central Indian Ocean. Geophysical Research Letters, 31(8): L08110. doi:10.1029/2003GL019269.