Chinese introduction - http://zh.wikipedia.org/wiki/概念圖 http://zh.wikipedia.org/wiki/心智圖

http://www.targetprocess.com/blog/2014/06/my-favourite-ways-to-visualize-ideas.html

http://www.caroli.org/urgency-and-importance-visualizing-it-on-a-graph/

玩转 Obsidian 01：打造知识循环利器 - https://sspai.com/post/62414

Split method, Modified Cornell method, Mind map, Flow notes - https://medium.com/@joashxu/note-writing-methods-i-use-7ae320ae2a79