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Christine Frey.College Campuses are going Green. __seattlepi.__ 22 August. 2008 < http://www.seattlepi.com/local/article/College-campuses-are-going-green-1212415.php#page-1>.

__grist.org__.Grist stuff. 11 August 2007 < http://grist.org/living/colleges1/>

Bulgariagazzete.com. 6 June 2009 < http://www.bulgariagazette.com/the-first-green-university-in-europe-in-varna/>

Other campus projects about energy sustainability. < http://www.youtube.com/watch?v=ph5jebgzskA>