In this appendix, we have collected some Web sites that have drawn our attention. Please do not consider this list as complete or particularly up to date. As with all URLs, you need to take into account that they were available at the time of writing, but there is no guarantee that they will be available at the time of reading, nor that they will contain the information they used to contain. For up to date information, please go to an online directory such as DMOZ [1] or a search engine such as Google [2] .
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