1. H. Puthoff, R. Targ, Central Intelligence Agency (CIA) (1974),
https://www.cia.gov/library/readingroom/document/cia-rdp96-00787r000100220005-4
2. H.E. Puthoff, Communication method and apparatus with signals comprising scalar and vector potentials without electromagnetic fields (1998)
3. N.K. Nikolova, R.K. Zimmerman, Electromagnetic wave-potential communication system (2012)
4. J.D. Jackson, L. Okun, Rev. Modern Phys. 73(3), 663–680 (2001)
5. J.P. Wesley, Apeiron 5(3–4), 219–226 (1998)