References
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- American Conference of Governmental Industrial Hygienists . 1996 Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices . Cincinnati, OH : ACGIH .
- Smyth , N. P. 1974 . The Pacemaker Patient and the Electromagnetic Environment . JAMA , 222 ( 5 ) : 89
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- Smyth , N. P. 1972 . Effect of an Active Magnetometer on Permanently Implanted Pacemarkers . JAMA , 221 ( 2 ) : 162 – 166 .