http://www.elect.mrt.ac.lk/EE201_network_theorems.pdf

http://www.google.com/url?sa=t&rct=j&q=network+theorem&source=web&cd=5&ved=0CFYQFjAE&url=http%3A%2F%2Fsst.nsu.edu%2Felt111%2Flecture_notes%2F9.ppt.ppt&ei=ODvPT4--IIG6-AaR89nsCw&usg=AFQjCNEQc3HQcHnLMSsO-E9ShRsooGAV6Q

http://en.wikipedia.org/wiki/Tellegen's_theorem

http://webserver.ignou.ac.in/schools/soet/CourseBook/Electrical%20Technology/Unit%202.pdf

http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=61091

http://es.scribd.com/doc/89193267/11/Two-Port-Network

http://books.google.com/books/about/Network_Analysis_And_Synthesis.html?id=i6C-gWdvImAC

http://books.google.com/books?id=7zEbl3Zu0HgC&source=gbs_similarbooks

http://www.math.utah.edu/~gustafso/s2012/2270/labs/Tellegen.pdf

http://www.google.com/url?sa=t&rct=j&q=%D8%B4%D8%A8%DA%A9%D9%87+%D8%B3%D9%88%D8%AF%D9%87+%D8%AF%D8%B1+%D9%85%D8%AF%D8%A7%D8%B1%D9%87%D8%A7%DB%8C+%D8%A7%D9%84%DA%A9%D8%AA%D8%B1%DB%8C%DA%A9%DB%8C&source=web&cd=1&ved=0CEsQFjAA&url=http%3A%2F%2Fwww.pnu.ac.ir%2Fportal%2FFile%2FShowFile.aspx%3FID%3D244a4f98-11fe-418d-9a07-b795600d6cd2&ei=FYbUT9GfBM6S0QX2tZH_Aw&usg=AFQjCNEmT84o_rk05bW0GAGjLyIxl9gtPQ