Conference paper (2009) - D Cabrera (author), X Martorell (author), Georgi Gaydadjiev (author), GN Gaydadjiev (author), G. Gaydadjiev (author), G. N. Gaydadjiev (author), Georgi N. Gaydadjiev (author), E Ayguade1 (author), D Jimenez-Gonzalez (author)