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Physical Review Letters|November 13, 2003
Numerical renormalization group for bosonic systems and application to the sub-ohmic spin-boson modelRalf Bulla, Ning-Hua Tong, Matthias VojtaPhysical Review Letters|March 24, 2005
Quantum phase transitions in the sub-Ohmic spin-boson model: failure of the quantum-classical mappingMatthias Vojta, Ning-Hua Tong, Ralf BullaJournal of Physics. Condensed Matter : an Institute of Physics Journal|June 22, 2011
Dissipative exciton transfer in donor-bridge-acceptor systems: numerical renormalization group calculation of equilibrium propertiesSabine Tornow, Ning-Hua Tong, Ralf BullaPhysical Review Letters|August 7, 2007
Equilibrium and nonequilibrium dynamics of the sub-Ohmic spin-boson modelFrithjof B Anders, Ralf Bulla, Matthias VojtaPhysical Review Letters|March 5, 2009
Quantum phase transition in the sub-Ohmic spin-boson model: quantum Monte Carlo study with a continuous imaginary time cluster algorithmAndré Winter, Heiko Rieger, Matthias Vojta, et al.Physical Review Letters|February 1, 2008
Zero-temperature magnetic transition in an easy-axis Kondo lattice modelJian-Xin Zhu, Stefan Kirchner, Ralf Bulla, et al.Pageof 1