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  24. Calculation of spin tunneling effects in the presence of an applied magnetic field (with J. Q. Liang, H. J. W. Mueller-Kirsten, and F. Zimmerschied). Phys. Lett. A 237 (1998), 169-174.

  25. Periodic bounce for nucleation rate at finite temperature in minisuperspace models (with J. Q. Liang, H. J. W. Mueller-Kirsten, B. Zhang, S. P. Kou, and D. K. Park). Phys. Rev. D 63 (2000), 025017.

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