1. Relativistic-particle kinematics and dynamics;Jackson,1962
2. The Poynting vector in Laguerre-Gaussian beams and the interpretation of their angular momentum density;Allen;Opt Commun,2000
3. Sjöholm J, Palmer K. Angular Momentum of Electromagnetic Radiation. Fundamental physics applied to the radio domain for innovative studies of space and development of new concepts in wireless communications. arXiv preprint arXiv:0905.0190. 2009 May 2. doi: 10.48550/arXiv.0905.0190.
4. Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes;Allen;Phys Rev A,1992
5. Utilization of photon orbital angular momentum in the low-frequency radio domain;Thidé;Phys Rev Lett,2007