http://www.youtube.com/watch?v=oBumTqIVpMQ http://www.youtube.com/watch?v=lHB2MvEt8XY -- Γιώργος Μπαλόγλου -- Θεσσαλονίκη http://www.oswego.edu/~baloglou (1988 - 2008) http://crystallomath.wordpress.com (2009 - )