Spinon and η-spinon correlation functions of the Hubbard chain P.D. Sacramento, Y.C. Li, S.J. Gu and J.M.P. Carmelo Eur. Phys. J. B, 86 12 (2013) 507 Published online: 16 December 2013 DOI: 10.1140/epjb/e2013-40684-y