?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=de+Ruigh&rft.au=de+Ruigh%2C+S.G.&rft.aufirst=S.G.&rft.degree=Master&rft.date=2017&rft.title=Seeking+High+Value+Added+Back+Offices%3A+Why+maritime+APS+firms+locate+in+Dutch+port-cities