@unpublished{Abramovsky2005,
author = {Laura Abramovsky and Elisabeth Kremp and Alberto López and Tobias Schmidt and Helen Simpson},
title = {Understanding co-operative R&D activity: evidence from four European countries},
year = {2005},
month = {Oct},
volume = {pp.},
doi = {10.1920/wp.ifs.2005.0523},
issn = {1742-0415},
url = {http://www.ifs.org.uk/wps/wp0523.pdf},
}