Zhang, X., Song, Y., Tang, S., Xue, H., Chen, W., Qin, L., Jia, S., Shen, Y., Zhao, S., Zhu, H., 2022. Models to assess imported cases on the rebound of COVID-19 and design a long-term border control strategy in Heilongjiang Province, China. Mathematical Biosciences and Engineering, Vol. 19 (1), p. 1-33