REFERENCES
- Zverev (AI). Handbook of Filler Synthesis. 1967. John Willy & Sons. P 499–518.
- Macal-PINE (WW) and Schild Knecht (RO). Coaxial resonators with Helical Inner Conductor. Proc. IRE. December 1959, 2099–2105.
- The Radio Amateurs Handbook. 1975, Published by American Radio Relay League, Chapter 9.