TITLE: Does there exist a "citation distance" calculator for papers or authors?
QUESTION [7 upvotes]: This question is not directly a mathematical question, but I am interested in whether there exists a calculator akin to an Erdős number calculator. The main difference is that I am not interested in coauthorship, but in citation distance; that is, I would like to link papers or authors by a chain of papers $P_1 , \dots , P_n$ such that $P_i$ either cites or is cited by $P_{i+1}$.
Considering how useful such a tool could be for detecting connections between different areas of math, I assume that someone has done this before. Any help is appreciated!

REPLY [6 votes]: If you have access to the Web of Science you could use the CitNetExplorer tool to create a citation network (documentation). This tool is used quite extensively, but I have not used it myself.
The arXiv has recently implented the LitMaps tool to create a citation network. I don't think Google Scholar offers a similar functionality.
Incidentally, the average citation distance between papers published in the same year decreased from approximately 5.33 to 3.18 steps between 1950 and 2018 (source).