Dopant-bound spinons in G. Els, G. S. Uhrig, P. Lemmens, H. Vonberg, P. H.M. van Loosdrecht, G. Güntherodt, O. Fujita, J. Akimitsu, G. Dhalenne and A. RevcolevschiEurophys. Lett., 43 4 (1998) 463-468DOI: https://doi.org/10.1209/epl/i1998-00382-3