http://www.umsl.edu/~chickosj/c365/lecture1.pdf
http://legacy.wlu.ca/documents/8176/CH303_Lecture1.pdf
http://www.dcne.ugto.mx/Contenido/MaterialDidactico/amezquita/Analitica4...
http://users.ox.ac.uk/~dplb0149/lecture/SpecCourseHO1.pdf
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