Research Policy
Research Policy > 2001 > 30 > 2 > 227-244
Research Policy > 2003 > 32 > 4 > 533-551
Research Policy > 2016 > 45 > 7 > 1474-1492
Research Policy > 2001 > 30 > 2 > 227-244
Research Policy > 2003 > 32 > 4 > 533-551
Research Policy > 2016 > 45 > 7 > 1474-1492