It is quite easy given a single article to find all the articles citing it.
However, having two or more articles, how do I find all the articles simultaneously citing these?
Using Google scholar, you can find the articles citing article #1. Then, you click the box "Search within citing articles" and you do a research for article #2.
Edit: I just realized this question is a duplicate of How to search for list of papers citing both papers A and B?
But I think my answer is far simpler.