https://www.academia.edu/108457249/%CE%94%CE%B5%CE%AF%CE%B3%CE%BC%CE%B1%CF%84%CE%B1_%CE%A0%CE%BF%CE%BB%CE%B9%CF%84%CE%B9%CE%BA%CE%AE%CF%82_%CE%94%CE%B9%CE%B1%CF%87%CE%B5%CE%AF%CF%81%CE%B9%CF%83%CE%B7%CF%82_%CE%91%CE%BD%CF%84%CF%8E%CE%BD%CE%B7%CF%82_%CE%9C%CE%AE%CE%BB%CF%84%CF%83%CE%BF%CF%82_
http://www.hms.gr/pythagoras/pdf/D_DHM_PYTAGORAS_11_03_2023.html