Butterworth filter (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Butterworth filter" in English language version.

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archive.org

books.google.com

changpuak.ch

  • Butterworth, S. (1930). "On the Theory of Filter Amplifiers" (PDF). Experimental Wireless and the Wireless Engineer. 7: 536–541.

doi.org

espacenet.com

worldwide.espacenet.com

  • US 1849656, William R. Bennett, "Transmission Network", published March 15, 1932 

handle.net

hdl.handle.net

harvard.edu

ui.adsabs.harvard.edu

loc.gov

lccn.loc.gov

  • Matthaei, George L.; Young, Leo; Jones, E. M. T. (1964). Microwave Filters, Impedance-Matching Networks, and Coupling Structures. McGraw-Hill. pp. 104–107, 105, and 974. LCCN 64007937.

oeis.org

semanticscholar.org

api.semanticscholar.org

wolfram.com

mathworld.wolfram.com

  • Weisstein, Eric W. "Golden Ratio". mathworld.wolfram.com. Retrieved 2020-08-10.