1. L. Manewitch, A. Kovaleva, V.Smirnov, Y. Starosvetski: Two Coupled Oscillators. (Springer, Singapore 2018)
2. https://en.wikipedia.org/wiki/Klystron
3. https://en.wikipedia.org/wiki/Dipole_antenna
4. http://www.tapir.caltech.edu/~teviet/Waves/empulse.html
5. NCSU Physics Demonstrations
https://www.academia.edu/25764528/RADIATION_OF_AN_ACCELERATED_CHARGE