One and two-photon detachment cross-sections of Ps- K. Maniadaki, L. A.A. Nikolopoulos and P. Lambropoulos Eur. Phys. J. D, 20 2 (2002) 205-209 Published online: 19 July 2002 DOI: 10.1140/epjd/e2002-00123-2