Bogdanova, Y. V., Klecker, B., Paschmann, G., Kistler, L. M., Mouikis, C., Moebius, E., Rème, H., Bosqued, J. M., Dandouras, I., Sauvaud, J. A., Cornilleau-Wehrlin, N., Laakso, H., Korth, A., Bavassano-Cattaneo, M. B., Marcucci, M. F., Phan, T., Carlson, C., Parks, G., McFadden, J. P., McCarthy, M., & Lundin, R. (2004). Investigation of the source region of ionospheric oxygen outflow in the cleft/cusp using multi-spacecraft observations by CIS onboard Cluster. Advances in Space Research, 34(11), 2459-2464. doi:10.1016/j.asr.2004.02.014.