Lazutin, L. L., Kozelova, T. V., Meredith, N. P., Danielides, M., Kozelov, B. V., Jussila, J., et al. (2007). Studies of the substorm on March 12, 1991: 1. Structure of substorm activity and auroral ions. Cosmic Research, 45(1), 27-38. doi:10.1134/S0010952507010042.