1. Anderson, E. R., Howe, R. & Komm, R. 1998, in Structure and Dynamics of the Sun and Sunlike Stars, ed. S. G. Korzennik & A. Wilson (ESA SP-418; Noordwijk: ESA), 901
2. P-mode frequency variation in relation to global solar activity
3. Christensen-Dalsgaard, J. & Berthomieu, G. 1991, in Solar Interior and Atmosphere, ed. A. N. Cox, W. C. Livingston, & M. Matthews (Tucson: Univ. Arizona Press), 401
4. Solar Cycle Onset Seen inSOHOMichelson Doppler Imager Seismic Data