Mechanism of action, safety and efficacy of intrauterine devices:  report of a WHO Scientific Group / 
WHO Scientific Group. 
 - Geneva :  World Health Organization,  1987. 
 - 91 p. 
 - Technical report series/  753 .
 - Technical report series (World Health Organization);  753 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intrauterine contraceptives<br/>Intrauterine contraceptives