U.S. Department of Health and Human Services (HHS), U.S. Public Health Service (PHS), Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH),
HETA 89-364-2202: 1-40
Osepchuk JM (ed.): Biological Effects of Electromagnetic Radiation. IEEE PRESS Selected Reprint Series; IEEE Press, New York; 85-90; ISBN 978-0-87942-165-6