■Soloar and geomagnetic activity, extremely low frequency magnetic and electric fields and human health at the Earth's surface 太陽と地磁気活動、極低周波電界および磁界そして地表におけるヒトの健康 S.J.Palmer M.J.Rycroft M.Cermack Springer Science+Business Media B.V.2006 Received 10 August 2005 / Accepted 5 July 2006 www.vitatec.com/docs/referenz-umgebungsstrahlung/palmer-2006.pdf