Thanh, T. D., Anh, N. T., Hien, N. T. T., Dong, H. M., Hao, N. X., Khoa, D. X., & Bang, N. H. (2021). Subluminal and superluminal light pulse propagation under external magnetic field in a vee-type three-level atomic medium. Photonics Letters of Poland, 13(1), 4–6. https://doi.org/10.4302/plp.v13i1.1076