This is a personal website with abundant content. Dr. Kardi Teknomo introduced some techniques used in PR or ML (machine learning) in a very friendly way. There are still many other topics which I don't know much, and may be also useful if you are searching them.
Lots of links. But the web page reads ``Due to a reorganisation we are not able anymore to maintain these files. They will be removed in the near future.'' I hope they keep maintaining these information if they have web space for it.