There are two API Keys. One is for the access of almost everything, except for text-mining capabilities (Elsevier_API). Another one (Elsevier_TM_API) is only for the purpose of using text-mining functionality. See URL for your restrictions below. The first one is always required whereas the second one is optional.
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- an empty parameter, e.g. NULL
Register your Keys http://dev.elsevier.com/myapikey.html
See for restrictions which apply to your key http://dev.elsevier.com/api_key_settings.html
options(Elsevier_API = "F1QH-Q64B-BSBI-JASJ", Elsevier_TM_API = "1QH-Q64B-BSBI-JAS")
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