1. C. J. E. Schuurmans and A. H. Oort, Pure Appl. Geophys. 75, 233, 1969.
2. J. M. Wilcox, P. H. Scherrer, L. Svalgaard, W. O. Roberts, and R. H. Olson, Science 180, 185, 1973.
3. J. M. Wilcox, Geophysical Predictions: Sun-Weather, Institute for riasma Research, Stanford University, SUIPR Report No. 687, March 1977.
4. H. H. Clayton, World Weather, The McMillan Company, New York, 1923.
5. W. O. Roberts, Possible Relationships Between Solar Activity and Meteorological Phenomena, ed. by W. R. Bandeen and S. P. Maran, NASA SP-366, p. 13, 1975.