שינויים
[http://math-wiki.com/images/1/18/%D7%90%D7%99%D7%A0%D7%A4%D7%99_1_-_%D7%94%D7%A8%D7%A6%D7%90%D7%94_1_%D7%9E%D7%AA%D7%95%D7%A7%D7%9F.pdf הרצאה 1]
[http://mahlocketmath-wiki.com/images/82/8d23/%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%A82ndlectureinfi.pdf הרצאה 2]
