http://www.matia.gr/7/73/7304/7304_1_5.html
http://el.wikipedia.org/wiki/%CE%9B%CE%B5%CE%BF%CE%BD%CE%AC%CF%81%CE%BD%CF%84%CE%BF_%CE%BD%CF%84%CE%B1_%CE%92%CE%AF%CE%BD%CF%84%CF%83%CE%B9
http://www.youtube.com/results?search_query=leonardo+da+vimci&sm=3
http://el.wikipedia.org/wiki/%CE%9B%CE%B5%CE%BF%CE%BD%CE%AC%CF%81%CE%BD%CF%84%CE%BF_%CE%BD%CF%84%CE%B1_%CE%92%CE%AF%CE%BD%CF%84%CF%83%CE%B9
http://www.youtube.com/results?search_query=leonardo+da+vimci&sm=3