Halberg F, Cornélissen G, Otsuka K, Watanabe Y, Katinas G, Burioka N, Delyukov A, Gorgo Y, Zhao Z, Weydahl A, Sothern R, Siegelova J, Fiser B, Dusek J, Syutkina E, Perfetto F, Tarquini R, Singh R, Rhees B, Lofstrom D, Lofstrom P, Johnson P, Schwartzkopff O, the International BIOCOS Study Group . Cross-spectrally coherent ~10.5- and 21-year biological and physical cycles, magnetic storms and myocardial infarctions*  Neuro Endocrinol Lett. 2000 Jan;  21(3): 233-258

Halberg F, Cornélissen G, Burioka N, Katinas G, Sampson M, Schwartzkopff O. Circasemicentennial Season's Appreciations.  Neuro Endocrinol Lett. 2000 Jan;  21(1): 59-68