Selvin, S <br/><br/>
Seasonal variation in twin births.  [electronic resource] 

 -  Nature  Jun 1972 
 - 289-90 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0028-0836 
<br/><br/><label>Standard No.: </label>10.1038/237289a0  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Female<br/>Humans<br/>New York<br/>Pregnancy<br/>Seasons<br/>Statistics as Topic<br/>Twins