Epidemiology, etiology, and prevention of periodontal diseases : report of a WHO scientific group [meeting held in Moscow from 23 November to 2 December 1977]. 

 - 60p. 
 - (WHO technical report series ; 621) .
<br/><br/><label>ISBN: </label>92-4-120621-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Periodontal diseases