B. G. U. Englert, G. Mangano, M. Mariantoni, R. Gross, J. Siewert, E. Solano: Mesoscopic shelving readout of superconducting qubits in circuit quantum electrodynamics. 2010Physical Review B: 81. ISBN 1098-0121 http://dx.doi.org/10.1103/PhysRevB.81.134514