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27-day cycles in human mortality: Traute and Bernhard Düll.
Halberg F, Düll-Pfaff N, Gumarova L, Zenchenko TA, Schwartzkopff O, Freytag EM, Freytag J, Cornelissen G. Halberg F, et al. Hist Geo Space Sci. 2013;4:10.5194/hgss-4-47-2013. doi: 10.5194/hgss-4-47-2013. Hist Geo Space Sci. 2013. PMID: 24224144 Free PMC article.
Egeson's (George's) transtridecadal weather cycling and sunspots.
Halberg F, Cornélissen G, Bernhardt KH, Sampson M, Schwartzkopff O, Sonntag D. Halberg F, et al. Hist Geo Space Sci. 2010 Sep 1;1(2):49-61. doi: 10.5194/hgss-1-49-2010. Hist Geo Space Sci. 2010. PMID: 21547003 Free PMC article.