Halberg Franz, Cornelissen Germaine, Bingham Christopher, Witte Herbert, Ribary Urs, Hesse Wolfram, Petsche Hellmuth, Engebretson Mark, Geissler Hans-Georg, Weiss Sabine, Klimesch Wolfgang, Rappelsberger Peter, Katinas George, Schwartzkopff Othild
Halberg Chronobiology Center, Universoty of Minnesota, Minneapolis, MN, USA.
Neuro Endocrinol Lett. 2003 Oct;24(5):355-80.