How can I retrieve the number of citations of a paper in a given year?
I had a look at Scopus Citation Overview API but the pybliometrics documentation says the API key needs to be approved by Elsevier for this purpose, and in fact it is returning error 403.
Are there other data sources from which I can retrieve the number of citations?
The rcrossref package provides a function cr_citation_count
which seems to get the number of citation today.
I need the number of citation at a given year (for instance, if a paper was published in 2010, I may need the number of citation in 2015, not as of today at 2021).