Theoretical investigation of the structures of unsupported 38-atom CuPt clusters Josafat Guerrero-Jordan, José Luis Cabellos, Roy L. Johnston and Alvaro Posada-Amarillas Eur. Phys. J. B, 91 6 (2018) 123 Published online: 18 June 2018 DOI: 10.1140/epjb/e2018-90020-2