Electromagnetic instability and Schwinger effect in the Witten–Sakai–Sugimoto model with D0–D4 backgroundWenhe Cai, Kang-le Li and Si-wen LiEur. Phys. J. C, 79 11 (2019) 904DOI: https://doi.org/10.1140/epjc/s10052-019-7404-1