How to identify the publications that cite two specific papers?
My procedure was simple but worked for me. It is similar but different to that suggested by tripartio.


Look up article A in Google Scholar.
Click the link for articles that cite that article A.
Check "Search within citing articles"
Type the details of article B in the search bar (e.g. authors or title)
Explore the results


This is not as systematic as would be ideal, but should help to give a first-cut idea.