https://www.cs.utexas.edu/~EWD/transcriptions/transcriptions.html
https://www.cs.utexas.edu/~EWD/ewd03xx/EWD340.PDF
https://en.wikipedia.org/wiki/Topological_sorting#Application_to_shortest_path_finding
https://dl.acm.org/doi/10.1145/355604.361591
https://en.wikipedia.org/wiki/Shortest_path_problem
https://www.cs.utexas.edu/~EWD/ewd02xx/EWD249.PDF
https://archive.org/details/disciplineofprog0000dijk/page/n245/mode/2up
https://pncnmnp.github.io/blogs/translating-dijakstra.html