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=0169409X&rft.volume=57&rft.spage=637&rfr_dat=md5:e199cb58f6a25effd5769abd87fd5dc3
