citation-style-language/styles — pull request #867 by adam3smith (2014-03-04 00:10:23+00:00)
Title: add DOI to Elsevier Harvar and Elsevier (with titles)

That's the two styles where the DOI is consistently encouraged in the instructions for authors. @rmzelle @cpina - could you take a quick look whether that's OK? This looks to be the format that the .bst style does this