TY - RPRT TI - (Spin-)density-functional theory for open-shell systems: Exact magnetization density functional for the half-filled Hubbard trimer AU - Ullrich, Carsten A. PY - 2019 DO - 10.1103/physreva.100.012516 UR - https://www.osti.gov/biblio/1545508 ID - 1545508 ER -