http://www.ece.jhu.edu/~cooper/courses/214/signalsandsystemsnotes.pdf
http://www3.nd.edu/~mhaenggi/ee344-04/overview.html
http://fourier.eng.hmc.edu/e102/lectures/Laplace_Transform/node7.html
http://sces.phys.utk.edu/~moreo/mm08/sarina.pdf
http://en.wikipedia.org/wiki/Laplace_transform
http://mathworld.wolfram.com/LaplaceTransform.html
http://fourier.eng.hmc.edu/e102/lectures/Laplace_Transform/node4.html
http://lpsa.swarthmore.edu/LaplaceZTable/LaplacePropTable.html
http://cnx.org/content/m10114/latest/
http://web.firat.edu.tr/agulucar/AM/laplaceforengineer.pdf
http://www.ee.ic.ac.uk/pcheung/teaching/ee2_signals/Lecture%206%20-%20Laplace%20Transform.pdf