Conference paper (2009) - X Gu (author), S Paprotskiy (author), C Sirtori (author), J.N. Hovenier (author), J.R. Gao (author), E Orlova (author), T.M. Klapwijk (author), P. Khosropanah (author), S. Barbieri (author), S Dhillon (author), P Filloux (author)