http://www.edaskalos.gr/mathematicslessons.html
https://e-didaskalia.blogspot.com/2012/09/online.html
http://e-didaskalia.blogspot.com/2013/12/online_27.html
http://tadeyterakiakaitoksotiko.blogspot.com/2013/03/blog-post_4.html
https://podilato98.blogspot.com/2015/06/paixnidia-me-tin-propaideia.html