On the Theory of Filter Amplifiers. Butterworth, S. Experimental Wireless & the Wireless Engineer, 7:536-541, October, 1930.
bibtex   
@article{Butterworth1930,
  title = {On the {{Theory}} of {{Filter Amplifiers}}},
  volume = {7},
  journal = {Experimental Wireless \& the Wireless Engineer},
  author = {Butterworth, S.},
  month = oct,
  year = {1930},
  pages = {536-541}
}

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