WORLD HEALTH ORGANIZATION. Génève. - Extremely low frequency fields 

. - Geneva  : World Health Organization, 2007
. - XXIV - 519 p.  ; 21 cm 
 - Environmental health criteria n° 238  0250-863X .
<br/><br/><label>ISBN: </label>978 92 4157238 5 
<br/><br/><label>Universal Decimal Class. No.: </label>614.876