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

http://www.physicsforums.com/showthread.php?t=496854

http://math.stackexchange.com/questions/135917/calculating-a-real-integral-using-complex-integration

http://www.math.odu.edu/~jhh/ch75.PDF

http://www.math.upenn.edu/~rimmer/math241/ch19sc6skeleton.pdf

http://www.mth.kcl.ac.uk/courses/cm211/19.pdf

http://www.math.umn.edu/~olver/am_/c.pdf

http://hitoshi.berkeley.edu/221a/contour.pdf

http://en.wikipedia.org/wiki/Wikipedia:Reference_desk/Archives/Mathematics/2009_August_3

http://math.fullerton.edu/mathews/c2003/integralsrational/IntegralsRationalMod/Links/IntegralsRationalMod_lnk_5.html

http://www.absoluteastronomy.com/topics/Fresnel_integral

http://math.fullerton.edu/mathews/c2003/integralstrigonometric/IntegralsTrigMod/Links/IntegralsTrigMod_lnk_1.html

http://math.fullerton.edu/mathews/c2003/integralsrational/integralsrationalmod/links/integralsrationalmod_lnk_3.html

http://math.fullerton.edu/mathews/c2003/integralsrational/integralsrationalmod/links/integralsrationalmod_lnk_4.html

http://www.dsprelated.com/dspbooks/sasp/Gaussian_Integral_Complex_Offset.html

https://www.classle.net/book/application-residue-theorem