1. Tree Rings and Climate;Frittz,1976
2. The sunspot cycle, 649 B.C. to A.D. 2000
3. Sunspot Cycles;Schove,1983
4. Evidence of a 22-Year Rhythm of Drought in the Western United Related to the Hale Solar Cycle since the 17th Century;Mitchell,1980
5. Climate response to the deVries solar cycles: Evidence of Juniperus turkestanica tree rings in Central Asia;Raspopov;Mem. Soc. Astron. Ital.,2005