1. Ahluwalia, H.S. Three activity cycle periodicity in galactic cosmic rays? in: 25th International Cosmic Ray Conference, vol. 2, pp. 109–112, 1997.
2. The predicted size of cycle 23 based on the inferred three cycle quasi-periodicity of the planetary index Ap;Ahluwalia;J. Geophys. Res.,1998
3. Ahluwalia, H.S. Three cycle quasi-periodicity in solar wind from polar coronal holes and the size of solar activity cycle 23, in: Habbal, S.R., Esser, R., Hollweg, J.V., IsenbergSolar, P.A. (Eds.), Solar Wind Nine: Proceedings of the Ninth International Solar Wind Conference. AIP: CP471, pp. 415–418, 1999a.
4. Reply;Ahluwalia;J. Geophys. Res.,1999
5. Solar cycle 23 prediction update;Ahluwalia;Adv. Space Res.,2000