Monitoring quantum oscillations with very small disturbance by J. Audretsch, F. E. Klee and T. Konrad in Phys. Lett. A 361, 212-217 (2007).
Entangled Systems - New Directions in Quantum Physics by J. Audretsch, Wiley-VCH, Weinheim, 2007.
Parameter estimation for mixed states from a single copy by T. Konrad, O. Gühne, J. Audretsch and H. J. Briegel, Physical Review A 75, 062101 (2007), e-print: quant-ph/0702211