With some pdf-files the generated entry id contains a comma. The extra comma is not allowed in bibtex, which results in a bib file with a syntax error.
This example pdf results in the following invalid bib entry:
@article{fu2005design,,
title = {Design, fabrication and testing of piezoelectric polymer PVDF microactuators},
volume = {15},
issue = {1},
page = {S141-S146},
publisher = {IOP Publishing},
url = {http://dx.doi.org/10.1088/0964-1726/15/1/023},
doi = {10.1088/0964-1726/15/1/023},
journal = {Smart Materials and Structures},
year = {2005},
month = {12},
author = {Yao Fu and Erol C Harvey and Muralidhar K Ghantasala and Geoff M Spinks}
}
With some pdf-files the generated entry id contains a comma. The extra comma is not allowed in bibtex, which results in a bib file with a syntax error.
This example pdf results in the following invalid bib entry: