1.Dynamical Mean Field Theory for the Bose-Hubbard Model, Wen-Jun Hu and Ning-Hua Tong, Phys. Rev. B 80, 245110 (2010).
2.Signatures of a Noise-Induced Quantum Phase Transition in a Mesoscopic Metal Ring, Ning-Hua Tong and Matthias Vojta, Phys. Rev. Lett. 97, 016802 (2006).
3.Extended Variational Cluster Approximation for Correlated Systems, Ning-Hua Tong, Phys. Rev. B 72, 115104 (2005).
4.Quantum Phase Transitions in the sub-Ohmic Spin-Boson Model: Failure of the Quantum-Classical Mapping, Matthias Vojta, Ning-Hua Tong, Ralf Bulla, Phys. Rev. Lett. 94, 070604 (2005).
5.Numerical Renormalization Group for Bosonic Systems and Application to the Sub-Ohmic Spin-Boson Model, Ralf Bulla, Ning-Hua Tong, and Matthias Vojta, Phys. Rev. Lett. 91, 170601 (2003).