BibTex format
@article{Acs:2014:10.1016/j.respol.2013.08.016,
author = {Acs, ZJ and Autio, E and Szerb, L},
doi = {10.1016/j.respol.2013.08.016},
journal = {Research Policy},
pages = {476--494},
title = {National Systems of Entrepreneurship: Measurement issues and policy implications},
url = {http://dx.doi.org/10.1016/j.respol.2013.08.016},
volume = {43},
year = {2014}
}