Searching for another thing I found this link[^] I have liked it because it talks about different things and seems ok (didn't read anything it in detail, jut did an overview), taking a look can be worthy.
Regards. -------- M.D.V. ;) If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about? Help me to understand what I'm saying, and I'll explain it better to you Rating helpfull answers is nice, but saying thanks can be even nicer.