Research Policy
Research Policy > 2006 > 35 > 5 > 729-744
Research Policy > 2006 > 35 > 9 > 1314-1328
Research Policy > 2006 > 35 > 10 > 1450-1464
Research Policy > 2006 > 35 > 5 > 729-744
Research Policy > 2006 > 35 > 9 > 1314-1328
Research Policy > 2006 > 35 > 10 > 1450-1464