?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Mergits%2C+Bert&rft.aulast=Mergits&rft.aufirst=Bert&rft.date=1991&rft.btitle=Codex+sociale+zekerheid+1991+92&rft.genre=book