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http://users.sch.gr/dimylonaki/mathimata_thriskia_grafi_minoiton.htm
http://www.authorstream.com/Presentation/angelo380-2461049/
https://www.slideshare.net/mfroudaraki/ss-35140573?next_slideshow=1
https://www.slideshare.net/mfroudaraki/ss-35140573?next_slideshow=1
http://ebooks.edu.gr/modules/ebook/show.php/DSDIM-C103/737/4825,21996/
https://pt.slideshare.net/irinikel/ss-53275324?ref=