Plasma cleaning and analysis of archeological artefacts from Spain - Saettone, E A O; Matta, J A S da; Alva, W; Chubaci, José Fernando Diniz; Fantini, Márcia Carvalho de Abreu; Galvão, Ricardo Magnus Osório; Kiyohara, Pedro Kunihiko; Tabacniks, Manfredo Harri (Journal of Physics D-Applied Physics, 2003)