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
Warning--empty pages in Berman05efficientenergy
You've used 44 entries,
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(There was 1 warning)