Zarhin, Yuri G. Max Planck Institute for Mathematics, Max Planck Society;
http://dx.doi.org/10.1090/spmj/1512 (Verlagsversion)
ArXiv_1702.02255.pdf (Preprint), 360KB
Bekker, B. M., & Zarhin, Y. G. (2018). Division by 2 of rational points on elliptic curves. St. Petersburg Mathematical Journal, 29(4), 683-713. doi:10.1090/spmj/1512.