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There are no ads on this website because we do not like ads.

There is no request to pay or register when downloading our books.

The books on this website were updated until may 2015. Many people copy my work and put their own name on it, on their own website with advertising, instead of linking to, this is not nice.

Scratch the previous line... there is a new pdf available on the home page since 3 October 2021.