This is BibTeX, Version 0.99d (TeX Live 2012/Debian)
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The top-level auxiliary file: elsarticle-template-num.aux
The style file: elsarticle-num.bst
Database file #1: elsarticle-template-num.bib
Repeated entry---line 569 of file elsarticle-template-num.bib
 : @article{wang2011coverage
 :                          ,
I'm skipping whatever remains of this entry
You've used 45 entries,
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(There was 1 error message)