An efficient implementation of two-component relativistic density functional theory with torque-free auxiliary variablesAlessio Petrone, David B. Williams-Young, Shichao Sun, Torin F. Stetina and Xiaosong LiEur. Phys. J. B, 91 7 (2018) 169DOI: https://doi.org/10.1140/epjb/e2018-90170-1