Seeley–DeWitt expansion of scattering phase shiftYuan-Yuan Liu, Yu-Jie Chen, Shi-Lin Li, Wen-Du Li and Wu-Sheng DaiEur. Phys. J. Plus, 137 10 (2022) 1140DOI: https://doi.org/10.1140/epjp/s13360-022-03380-5