Books on fractals

To make "fractal" mountains, you can use a simple algorithm:

Start with a simple triangle, put three points in the middle of the edges. Move up these points with random amounts (this amount should scale to the size of the triangle, this is very important). Connects the points and you have four triangles. Recursively perform the same thing on these four triangles, and for some iterations you'll have a nice terrain.
 
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