Meier-Vismara, E <br/><br/>
[Natural family planning: ovulation method after Billings (author's transl)].  [electronic resource] 

 -  Geburtshilfe und Frauenheilkunde  Jan 1982 
 - 66-9 p.  digital 
<br/><br/> Publication Type: English Abstract; Journal Article; Review 
<br/><br/><label>ISSN: </label>0016-5751 
<br/><br/><label>Standard No.: </label>10.1055/s-2008-1036626  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Female<br/>Humans<br/>Natural Family Planning Methods<br/>World Health Organization