References

[Dij59]E. W. Dijkstra. A Note on Two Problems in Connexion with Graphs. Numerische Mathematik, 1(1):269–271, 1959. doi:10.1007/BF01386390.
[OY01]Atsuyuki Okabe and Ikuho Yamada. The K-Function Method on a Network and Its Computational Implementation. Geographical Analysis, 33(3):271–290, 2001.