• http://www.us.debian.org/doc/developers-reference/index.en.html#contents
• http://refcards.com/refcards/index.html # Perl
• http://farm.tucows.com/images/2006/05/vi-vim_cheat_sheet.gif # VI
• http://www.lulu.com/fr
• http://en.wikipedia.org/w/index.php?title=Apollo_Moon_Landing_hoax_accusations&printable=yes
• http://kafka.fr.free.fr/articles/index.html # Python
• https://www.vecteezy.com/free-vector/psychedelic
  • https://static.vecteezy.com/system/resources/svgs/000/168/617/original/7c013b2c-445d-4f28-b398-5cdce365f2ca.svg?1511901399 PsY
  • https://static.vecteezy.com/system/resources/previews/000/163/475/original/hypnosis-optical-illusion-vector.png
  • https://static.vecteezy.com/system/resources/svgs/000/163/475/original/hypnosis.svg
• isbn:978-92-79-21088-4

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