Journal article (2008) - M. Hajenius (author), P. Khosropanah (author), HE Beere (author), J.N. Hovenier (author), J.R. Gao (author), T.M. Klapwijk (author), S Barbieri (author), S Dhillon (author), P Filloux (author), C Sirtori (author), DA Ritchi (author)