Penny, David <br/><br/>
Evolutionary biology: mass survivals.  [electronic resource] 

 -  Nature  Mar 2007 
 - 501-2 p.  digital 
<br/><br/> Publication Type: Comment; Historical Article; News 
<br/><br/><label>ISSN: </label>1476-4687 
<br/><br/><label>Standard No.: </label>10.1038/446501a  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animals<br/>Dinosaurs--classification<br/>Extinction, Biological<br/>Fossils<br/>History, Ancient<br/>Mammals--classification<br/>Phylogeny<br/>Time Factors