?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Bertin%2C+R.J.V.&rft.aulast=Bertin&rft.aufirst=R.J.V.&rft.date=June+1994&rft.title=Natural+smartness+in+hypothetical+animals.+Of+paddlers+and+glowballs&rft.inst=Universiteit+Utrecht