A comparison of the magnetic properties of proton- and iron-implanted graphite J. Barzola-Quiquia, R. Höhne, M. Rothermel, A. Setzer, P. Esquinazi and V. Heera Eur. Phys. J. B, 61 2 (2008) 127-130 Published online: 06 February 2008 DOI: 10.1140/epjb/e2008-00047-7