Optimal rates for the parameter prediction of a Gaussian Vasicek process Anas D. Khalaf, Anwar Zeb, Younis A. Sabawi, Salih Djilali and Xiangjun Wang Eur. Phys. J. Plus, 136 8 (2021) 808 Published online: 06 August 2021 DOI: 10.1140/epjp/s13360-021-01738-9