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Fermat's principle in general relativity.
Nityananda R, Samuel J. Nityananda R, et al. Phys Rev D Part Fields. 1992 May 15;45(10):3862-3864. doi: 10.1103/physrevd.45.3862. Phys Rev D Part Fields. 1992. PMID: 10014279 No abstract available.
Comment on "Spin-gradient-driven light amplification in a quantum plasma".
Krishnaswami GS, Nityananda R, Sen A, Thyagaraja A. Krishnaswami GS, et al. Among authors: nityananda r. Phys Rev Lett. 2014 Mar 28;112(12):129501. doi: 10.1103/PhysRevLett.112.129501. Epub 2014 Mar 28. Phys Rev Lett. 2014. PMID: 24724689 No abstract available.