van Zeebroeck, N. (2009). From patent renewals to applications survival: do portfolio management strategies play a role in patent length? (Working papers CEB No 09-028.RS)., ULB
van Zeebroeck, N. (2009). From patent renewals to applications survival: do portfolio management strategies play a role in patent length? (Working papers CEB No 09-028.RS)., ULB