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Chou, C. H., Hu, B. L., & Yu, T. . (2008). Quantum Brownian motion of a macroscopic object in a general environment. Physica a-Statistical Mechanics and Its Applications, 387, 432–444. http://doi.org/10.1016/j.physa.2007.09.025

Chou, C. H., Yu, T. ., & Hu, B. L. (2008). Exact master equation and quantum decoherence of two coupled harmonic oscillators in a general environment. Physical Review E, 77. http://doi.org/10.1103/PhysRevE.77.011112