שינויים
[http://mahlocketmath-wiki.com/images/61/6118/%D7%90%D7%99%D7%A0%D7%A4%D7%99_1_-_%D7%94%D7%A8%D7%A6%D7%90%D7%94_194_1_%D7%9E%D7%AA%D7%95%D7%A7%D7%9F.pdf הרצאה 1]
[http://mahlocket.com/images/8/8d/%D7%94%D7%A8%D7%A6%D7%90%D7%94_2_-_%D7%90%D7%99%D7%A0%D7%A4%D7%99_1-_%D7%93%D7%91%D7%99%D7%A8.pdf הרצאה 2]
