Nandi, Kamal K. & Zhang, Yuan-Zhong (2004). "A Quantum Constraint for the Physical Viability of Classical Traversable Lorentzian Wormholes". J. Nonlinear Phenomena in Complex Systems (). 9 (2006): 61–67. arXiv:gr-qc/0409053. Bibcode:2004gr.qc.....9053N.
Nandi, Kamal K. & Zhang, Yuan-Zhong (2004). "A Quantum Constraint for the Physical Viability of Classical Traversable Lorentzian Wormholes". J. Nonlinear Phenomena in Complex Systems (). 9 (2006): 61–67. arXiv:gr-qc/0409053. Bibcode:2004gr.qc.....9053N.