http://iitg.vlab.co.in/?sub=59&brch=166&sim=618&cnt=1

https://engineering.purdue.edu/~bouman/ece301/notes/pdf/SysProp.pdf

http://users.ece.gatech.edu/~bonnie/book/worked_problems.html

http://www.niceindia.com/qbank/it1201_signals_and_systems__.pdf

http://ws2.binghamton.edu/fowler/fowler%20personal%20page/EE301_files/EECE%20301%20Note%20Set%205%20System%20Properties.pdf

http://faemino.ucsd.edu/~soniamartinez/teaching/143a_SignalsSystems/data/analog-systems.pdf

http://assets.cambridge.org/97805218/49661/excerpt/9780521849661_excerpt.pdf

http://maxim.ece.illinois.edu/teaching/fall08/lec3.pdf

http://www.le.ac.uk/eg/mct6/teaching/eg1110/lect2_4.pdf

http://en.wikibooks.org/wiki/Signals_and_Systems/Time_Domain_Analysis

http://web.eecs.umich.edu/~fessler/course/451/l/pdf/c2.pdf

http://www.ece.jhu.edu/~cooper/courses/214/signalsandsystemsnotes.pdf

http://www3.nd.edu/~mhaenggi/ee344-04/overview.html

http://www.le.ac.uk/eg/mct6/teaching/eg1110/intro_lect_4.pdf

http://www.google.com/url?sa=t&rct=j&q=lti+systems+and+their+properties&source=web&cd=9&cad=rja&ved=0CGAQFjAI&url=http%3A%2F%2Fwww.le.ac.uk%2Feg%2Frqqg1%2FLectures%2FLecture3.ppt&ei=RNPmUNXoKZCa0QXlmIHQAQ&usg=AFQjCNHGOXLiAANthpS7O4S-Gya5Lf0UMQ&bvm=bv.1355534169,d.d2k

http://www.eas.uccs.edu/wickert/ece2610/lecture_notes/LTIPropertiesExample_solved.pdf

http://www.btechguru.com/pro_one/keywordLevel~Electronics%20and%20Communication~Signals%20and%20systems~Linear%20time%20invariant(LTI)%20system%20:definitions%20and%20properties%20~4134d566a650233c~e70f27ff0f219b5e~810dabc5c418becc~list.html

http://www.ece.mcmaster.ca/~kiruba/3tp4/3tp4.html