Franz Halberg , Germaine Cornélissen , George Katinas , Elena V Syutkina , Robert B Sothern , Rina Zaslavskaya , Francine Halberg , Yoshihiko Watanabe , Othild Schwartzkopff , Kuniaki Otsuka , Roberto Tarquini , Perfetto Frederico and Jarmila Siggelova
Journal of Circadian Rhythms 2003, 1:2doi:10.1186/1740-3391-1-2