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),
DHHS (NIOSH) Publication Number 98-131: 1-43
Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269), Melbourne, Victoria, Australia. IEEE: pp. 113-114; ISBN 978-0-7803-3867-8