Earlier quoted context omitted.
Nice, I forgot to search for alternate sources. It's a very nice gallery (with some maths too) of fractals, I'd be happy to have other sources for more complex and recent knowledge about them.
It's literally a button there. "Read Online".
Weird, so eager to read the main content I only saw the 'Buy the Book' button at the bottom. Too used to leanpub layout methink.