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

http://158.132.21.81/class/EIE312/LS102_LTIS.pdf

http://itee.uq.edu.au/~coms3100/Lecture%20Notes/lec04.pdf

http://www.cis.hut.fi/Opinnot/T-61.140/Luennot/Ch2.pdf

http://faemino.ucsd.edu/~soniamartinez/teaching/143a_SignalsSystems/data/impulse-response.pdf

http://www.ece.mcgill.ca/~mvu5/ES150/8-lti_psd.pdf

http://en.wikipedia.org/wiki/Laplace_transform

http://www.intmath.com/laplace-transformation/10-applications.php

http://www.vis.uky.edu/~cheung/courses/ee422g/lecture6.pdf

http://fourier.eng.hmc.edu/e102/lectures/Laplace_Transform/node3.html

http://fourier.eng.hmc.edu/e101/lectures/Laplace_Transform/node8.html

http://books.google.com/books?id=MQPeFiB9cSQC&pg=PA363&lpg=PA363&dq=LTI+systems+analytic&source=bl&ots=59dK4ldJiH&sig=RKj4z7ZFpqkY6dqiJqv05fT9rDM&hl=en&sa=X&ei=Fv_mUKCbF7Ck0AWw5YCgDQ&ved=0CGAQ6AEwCTgK

http://course.ee.ust.hk/elec215/lecture/Chapter-5-Transient-and-Frequency-responses-of-LTI-systems.pdf

http://en.wikipedia.org/wiki/Routh%E2%80%93Hurwitz_stability_criterion

http://www.egr.msu.edu/classes/me451/jchoi/Fall2011/notes/ME451_L10_RouthHurwitz.pdf

http://www.atp.ruhr-uni-bochum.de/rt1/syscontrol/node40.html

http://www.ece.rutgers.edu/~npuri/research/stable_poly.pdf

http://www.google.com/url?sa=t&rct=j&q=root+hurwitz+criteria&source=web&cd=7&cad=rja&ved=0CFgQFjAG&url=http%3A%2F%2Fwww.calvin.edu%2F~pribeiro%2Fcourses%2Fengr315%2Flectures-notes%2FChapter-6.ppt&ei=6gDnUIDmFuXF0QXpkYDACw&usg=AFQjCNEIXsn4tVViE8UQxRil5vY_UOc2Tw&bvm=bv.1355534169,d.d2k

http://people.usd.edu/~jflores/Math735/MMChapter4_4p5.pdf

http://staff.ui.ac.id/internal/130702176/material/Lecture5-StabilityCriterion-Routh-HurwitzTest20Oct08.pdf