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

http://www-users.cs.york.ac.uk/~fisher/mkfilter/trad.html

http://www-k.ext.ti.com/SRVS/Data/ti/KnowledgeBases/analog/document/faqs/ch.htm

http://users.ece.gatech.edu/mleach/ece3050/f99/cheb.pdf

http://www.engr.uky.edu/~gedney/courses/ee521/notes/Set5_LadderFilterAndPuff.pdf

http://site.iugaza.edu.ps/aliafana/files/2010/04/02_analog_filters.pdf

http://www.dspguide.com/ch20.htm

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

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3265070/

http://www.rfcurrent.com/gencheb

http://eceweb1.rutgers.edu/~orfanidi/ece521/notes.pdf 

http://www.matheonics.com/Tutorials/Chebyshev.html