Contributions to intenational conferences (co-authorship)

L.A. Popa, P.Stefanescu, Probing cosmic dark ages with CMB polarization measurements, Proceedings of Eleventh Marcel Grossmann Meeting on General Relativity, (edt. H. Kleinert, R.T. Jantzen and R. Ruffini) World Scientific, Singapore, 2007

F.Melchiorri, L.A.Popa, P.Stefanescu, Search for Cosmic Far Infrared Background in COBE-FIRAS data, "The Far Infrared and Submillimetre Universe", 1997, ESA SP-401, 309-311 (edt. by A. Wilson)