1. Altrock, R.C.: 1997, Solar Phys. 170, 411.
2. Altrock, R.C.: 2003, Solar Phys. 216, 343.
3. Altrock, R.C.: 2007, Eos, Trans. Am. Geophys. Union 88(52), Fall Meeting Suppl., Abstract SH53A-1052.
4. Altrock, R.C., Howe, R., Ulrich, R.: 2008, In: Howe, R., Komm, R.W., Balasubramaniam, K.S., Petrie, G.J. (eds.) Subsurface and Atmospheric Influences on Solar Activity CS-383, Astron. Soc. Pac., San Francisco, 335.
5. Fisher, R.R.: 1973, AFCRL-TR-73-0696, 15 pp.