@misc{kaymak2018beam,
    title={Beam with Adaptive Divergence Angle in Free-Space Optical Communications for High-Speed Trains},
    author={Yagiz Kaymak and Sina Fathi-Kazerooni and Roberto Rojas-Cessa and JiangHua Feng and Nirwan Ansari and MengChu Zhou and Tairan Zhang},
    year={2018},
    eprint={1812.11233},
    archivePrefix={arXiv},
    primaryClass={eess.SP}
}