Japanese painting

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I'm getting more and more interested in it. :book: Are there any available resources to acquire more in-depth information on æsthetics, history, techniques etc?

I'm asking because just noticed that a friend of mine, who happens to make illustrations for pastime, has a resembling style.

~:wave:
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found a couple of links:

http://www.artelino.com/articles/japanese-painting.asp

http://witcombe.sbc.edu/ARTHLinks3.html#japan (unfortunately a lot of the links are broken)