olemus
orienteeritud graaf

ülevaateid
https://mathinsight.org/definition/network

https://mathinsight.org/network_introduction

https://encyclopediaofmath.org/wiki/Network

https://en.wikipedia.org/wiki/Network_theory

https://math.ucr.edu/home/baez/econ.pdf

http://edshare.soton.ac.uk/922/2/index.html

vt ka
- võrk (1)