Ali
Google Scholar Author Citation API does not work.
Here is the API documentation: https://serpapi.com/google-scholar-author-citation
Here is a Playground example: https://serpapi.com/playground?engine=google_scholar_author&author_id=8XNfVucAAAAJ&hl=en&view_op=view_citation&citation_id=8XNfVucAAAAJ%3AfFSKOagxvKUC&no_cache=true
As you can see in the picture, no information from the page is parsed.

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