Impact factor
<p>Apr 23, 2010 5:39 PM
 
IF = impact factor;
 
devised by Eugene Garfield.
 
of citations to articles in the journal /  total # of citable articles.
 
TOP Journals are  Nature,  Science,  NEJM,  Cell,  PNAS,, J Bio Chem, JAMA,
Lancet,  Nat Genetics,  Nat Med.</p>