PSI 20 Composition

The best place to find updated information on PSI-20 composition and it's rules is naturally the Euronext site. However it is common to find in the internet other not so accurate pages that rank considerably higher in the search engines and that can mislead the user.
Wikipedia, for instance, hardly is the best place to find updated information on the Portuguese stock exchange, specially now with the increased volatility that the new rules for the PSI 20 composition introduced.
The side bar will, in the near future, include a section with some utilities for the users with the best links to find relevant information.