M. Mariantoni, E. P. Menzel, F. Deppe, M. A. Araque Caballero, A. Baust, T. Niemczyk, E. Hoffmann, E. Solano, A. Marx, R. Gross: Planck Spectroscopy and Quantum Noise of Microwave Beam Splitters. 2010Physical Review Letters: 105. ISBN 0031-9007 http://dx.doi.org/10.1103/PhysRevLett.105.133601