1. Andrews, D.G., J.R. Holton, and C.B. Leovy, 1987: Middle atmosphere dynamics, Elsevier, New York, 489 pp.
2. Christiansen, B., 2003: Temporal growth and vertical propagation of perturbations in the winter atmosphere. Quart. J. Roy. Meteor. Soc., 129, 1589-1605.
3. A Possible Influence of Equatorial Winds on the September 2002 Southern Hemisphere Sudden Warming Event
4. Ichimaru, T., T. Hirooka, and H. Mukougawa, 2007: Stratospheric sudden warmings in the winter of 2005/06 and the predictability. Meteor. Res. Notes, 216, 151-159. (in Japanese)
5. Japan Meteorological Agency, 2002: Outline of the operational numerical weather prediction at the Japan Meteorological Agency (JMA). Appendix to WMO Numerical Weather Prediction Progress Report, JMA, Tokyo, 157 pp.