1. Orbital angular momentum of channeling radiation from relativistic electrons in thin Si crystal
2. Spiral light beams
3. Afanasev, A., Serbo, V.G., Solyanik, M., 2017.https://arxiv.org/abs/1709.05625.
4. Shuliga, High-Energy Electrodynamics in Matter;Akhiezer,1996
5. The Angular Momentum of Light;Andrews,2012