Muschietti, L.; Dum, C. T. (1993). "Real group velocity in a medium with dissipation". Physics of Fluids B: Plasma Physics. 5 (5): 1383. Bibcode:1993PhFlB...5.1383M. doi:10.1063/1.860877.
Bigelow, Matthew S.; Lepeshkin, Nick N.; Shin, Heedeuk; Boyd, Robert W. (2006), "Propagation of a smooth and discontinuous pulses through materials with very large or very small group velocities", Journal of Physics: Condensed Matter, 18 (11): 3117–3126, Bibcode:2006JPCM...18.3117B, doi:10.1088/0953-8984/18/11/017, S2CID38556364
Withayachumnankul, W.; Fischer, B. M.; Ferguson, B.; Davis, B. R.; Abbott, D. (2010), "A Systemized View of Superluminal Wave Propagation", Proceedings of the IEEE, 98 (10): 1775–1786, doi:10.1109/JPROC.2010.2052910, S2CID15100571
Gehring, George M.; Schweinsberg, Aaron; Barsi, Christopher; Kostinski, Natalie; Boyd, Robert W. (2006), "Observation of a Backward Pulse Propagation Through a Medium with a Negative Group Velocity", Science, 312 (5775): 895–897, Bibcode:2006Sci...312..895G, doi:10.1126/science.1124524, PMID16690861, S2CID28800603
Muschietti, L.; Dum, C. T. (1993). "Real group velocity in a medium with dissipation". Physics of Fluids B: Plasma Physics. 5 (5): 1383. Bibcode:1993PhFlB...5.1383M. doi:10.1063/1.860877.
Bigelow, Matthew S.; Lepeshkin, Nick N.; Shin, Heedeuk; Boyd, Robert W. (2006), "Propagation of a smooth and discontinuous pulses through materials with very large or very small group velocities", Journal of Physics: Condensed Matter, 18 (11): 3117–3126, Bibcode:2006JPCM...18.3117B, doi:10.1088/0953-8984/18/11/017, S2CID38556364
Gehring, George M.; Schweinsberg, Aaron; Barsi, Christopher; Kostinski, Natalie; Boyd, Robert W. (2006), "Observation of a Backward Pulse Propagation Through a Medium with a Negative Group Velocity", Science, 312 (5775): 895–897, Bibcode:2006Sci...312..895G, doi:10.1126/science.1124524, PMID16690861, S2CID28800603
Gehring, George M.; Schweinsberg, Aaron; Barsi, Christopher; Kostinski, Natalie; Boyd, Robert W. (2006), "Observation of a Backward Pulse Propagation Through a Medium with a Negative Group Velocity", Science, 312 (5775): 895–897, Bibcode:2006Sci...312..895G, doi:10.1126/science.1124524, PMID16690861, S2CID28800603
Bigelow, Matthew S.; Lepeshkin, Nick N.; Shin, Heedeuk; Boyd, Robert W. (2006), "Propagation of a smooth and discontinuous pulses through materials with very large or very small group velocities", Journal of Physics: Condensed Matter, 18 (11): 3117–3126, Bibcode:2006JPCM...18.3117B, doi:10.1088/0953-8984/18/11/017, S2CID38556364
Withayachumnankul, W.; Fischer, B. M.; Ferguson, B.; Davis, B. R.; Abbott, D. (2010), "A Systemized View of Superluminal Wave Propagation", Proceedings of the IEEE, 98 (10): 1775–1786, doi:10.1109/JPROC.2010.2052910, S2CID15100571
Gehring, George M.; Schweinsberg, Aaron; Barsi, Christopher; Kostinski, Natalie; Boyd, Robert W. (2006), "Observation of a Backward Pulse Propagation Through a Medium with a Negative Group Velocity", Science, 312 (5775): 895–897, Bibcode:2006Sci...312..895G, doi:10.1126/science.1124524, PMID16690861, S2CID28800603