1. On the Theory of Filter Amplifiers;Butterworth;Wireless Engineer,1930
2. Maximally Flat Delay Networks;Thomson;IRE Trans. Circuit Theory,1959
3. Delay Networks Having Maximally Flat Frequency Characteristics;Thomson,1949
4. Analysis and Synthesis of Transitional Butterworth-Thomson Filters and Band-pass Amplifiers;Peless;RCA Rev.,1957
5. Pulse Networks with Parabolic Distribution of Poles;Mullick;IRE Trans. Circuit Theory,1961