1. F.A. Kingsley: The Development of Radar Equipments for the Royal Navy, 1935–45 (Palgrave Macmillan, London 1995)
2. Telecommunication Standardization Sector (ITU-T): Recommendation G.691: Optical interfaces for single channel STM-64 and other SDH systems with optical amplifiers, available at
https://www.itu.int/rec/T-REC-G/en
3. Telecommunication Standardization Sector (ITU-T): Recommendation G.694.1: Spectral grids for WDM applications: DWDM frequency grid, available at
https://www.itu.int/rec/T-REC-G/en
4. Telecommunication Standardization Sector (ITU-T): Recommendation G.694.2: Spectral grids for WDM applications: CWDM wavelength grid, available at
https://www.itu.int/rec/T-REC-G/en
5. C.H. Sterling: Military Communications: From Ancient Times to the 21st Century (ABC-CLIO, Santa Barbara 2007)