Cleaning up/Uniformize bibliography for long document
If you have the DOI codes, the best thing is to use the API and get the references yourself:

curl -LH "Accept: text/bibliography; style=bibtex" http://dx.doi.org/[DOI code]


If you have them (and you should, for any modern article), parsing the bib to get them and getting the data can be done in a very simple script.