Online toegang naar https://www.sciencedirect.com/science/link?ref_val_fmt=info:ofi/fmt:kev:mtx:journal&svc_val_fmt=info:ofi/fmt:kev:mtx:sch_srv&rfr_dat=saltver:1&rfr_dat=origin:ONECATE&ctx_enc=info:ofi/enc:UTF-8&ctx_ver=Z39.88-2004&rft.issn=00452068&rft.volume=80&rft.spage=525&rfr_dat=md5:0db3f821ca1a26be06c8a74b5450990e
