Conference paper (2012) - A. Endo (author), J.J.A. Baselmans (author), P.J. de Visser (author), R.M.J. Janssen (author), T.M. Klapwijk (author), PP van der werf (author), B. Knoors (author), S.M.H. Javadzadeh (author), SJC Yates Yates (author), David Thoen (author), L Ferrari Ferrari (author), AM Baryshev Baryshev (author), YJY Lankwarden (author)