DarlingtonS., Synthesis of reactance 4-poles which produce prescribed insertion loss characteristics. J. math. Phys.18, 257 (1939).
2.
BodeH. W., Network Analysis and Feedback Amplifier Design. D. Van Nostrand Co Inc., New York (1945).
3.
WeinbergL., Network Analysis and Synthesis. McGraw-Hill, New York (1962).
4.
HoltA. G. J., An experiment on the maximally flat magnitude, Chebyshev and maximally flat delay response filters. Bull. Elec. Engng. Ed., 29, 52 (1962).