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In order to understand a paper better, someone suggested reading the commentary of a paper X first before actually reading the original paper. However, this seems to be a nontrivial task since there is no easy way to forward-track papers that cite one specific paper (i.e. paper X) while backward-tracking is straightforward.
More generally, is there tool/service that could build citation graph of a pool of papers, which might be one way to do both forward and backward tracking.
Google Scholar is one of several repositories that has such a citation graph (and I find it the most straightforward for doing the task you are suggesting).
Every entry in Google Scholar that has been cited and had those citations tracked in Google Scholar comes with a "Cited by N" link; clicking that link gives you a list of all of those citations.
https://scholar.google.com/scholar?cites=17803823686299873243&as_sdt=5,50&sciodt=0,50&hl=en
You can also search within those citing articles.
