CheckDOI checks if a doi is valid (registered) by querying doi.org for a good response.

Fetch downloads articles from Sci-Hub and/or citations from Crossref, from a list of supplied handles (DOIs and/or ISBNs).

Available modes of the Fetch function.

Available modes of the Fetch function.

Available modes of the Fetch function.

CiteAppend controls whether the citation file will be appended to or overwritten.

CiteFileName is the citation filename base (w/o extension).

CiteFormat is the citation output format.

CiteSeparate controls whether the citations will be written to separate files.

GlobalRateLimiter is the global outgoing HTTP request limiter.

GlobalReqTimeout is the global HTTP request timeout.

NoUserAgent controls weather to omit the User-Agent header in HTTP requests.

FetchMode signifies the mode in which the Fetch function will run.