Invariants of the electromagnetic field
Journal of mathematical physics, 2014-03, Vol.55 (3), p.1 [Peer Reviewed Journal]AIP Publishing LLC ;Copyright American Institute of Physics Mar 2014 ;2014 AIP Publishing LLC. ;ISSN: 0022-2488 ;EISSN: 1089-7658 ;DOI: 10.1063/1.4868478 ;CODEN: JMAPAQ
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