?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Wals%2C+J.R.J.&rft.aulast=Wals&rft.aufirst=J.R.J.&rft.date=2016&rft.degree=Master&rft.title=Increasing+flexibility+throughout+a+planning+lifecycle%3B+a+focus+on+effects+in+contracts+and+tender+phases