http://dx.doi.org.ucc.idm.oclc.org/10.1016/S0014-5793(01)03313-0 http://api.elsevier.com.ucc.idm.oclc.org/content/article/doi/10.1016/S0014-5793(01)03313-0 10.1016/S0014-5793(01)03313-0 S0014-5793(01)03313-0 S0014579301033130 1-s2.0-S0014579301033130 true Requestor is entitled to the requested resource