?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Jelmer&rft.au=Schuil%2C+Jelmer&rft.aulast=Schuil&rft.date=2021&rft.tpages=73&rft.title=The+influence+of+COVID-19+on+the+happiness+of+Groningen+residents&rft.degree=Master