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http://www.graphviz.org/pdf/dotguide.pdf

https://graphs.grevian.org/reference

http://zhangliyong.github.io/posts/2014/02/23/graphviz-tutorial.html

https://renenyffenegger.ch/notes/tools/Graphviz/examples/index

https://graphviz.gitlab.io/_pages/doc/info/shapes.html#html

https://graphviz.gitlab.io/faq/#FaqCustShape

https://github.com/mountainstorm/jquery.graphviz.svg

https://argdown.org/guide/changing-the-graph-layout.html#layouting-with-viz-js

https://forum.graphviz.org/t/layout-in-vertical-column-with-side-notes/290/3

https://stackoverflow.com/questions/2467450/control-layout-using-graphviz-twopi

https://graphviz.readthedocs.io/en/stable/manual.html#engines

https://mikemol.github.io/graphviz/dot/2018/02/27/graphviz-dot-basics-pt-2.html

https://www.linuxjournal.com/article/7275?page=0,0

Examples
https://sketchviz.com/graphviz-examples