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!