1. Wave Propagation over Non-Uniform Cables and Long Distance Air-Lines;Pupin;Trans. A. I. E. E.,1900
2. On Loaded Lines in Telephonic Transmission;Campbell;Phil. Mag.,1903
3. Theory and Design of Uniform and Composite Electric Wave Filters;Zobel;Bell System Tech. Journal,1923
4. A General Theory of Electric Wave Filters;Bode;Journal of Math. and Physics,1934
5. Ein Reaktanztheorem;Cauer;Preuss. Akad. d. Wissenschaften, Phys.-Math. Kl., Sitzber., Nos.,1931