Gradient-level and nonlocal density functional descriptions of Cu-Au intermetallic compounds Henrik Levämäki, Liyun Tian, Kalevi Kokko and Levente Vitos Eur. Phys. J. B, 91 6 (2018) 128 Published online: 22 June 2018 DOI: 10.1140/epjb/e2018-90166-9