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Obituary A tribute to the memory of professor Alexander K. Popov
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DOI：10.1515/nanoph-2022-0655.png)
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Abstract
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Keywords:
NEGATIVE-INDEX METAMATERIALS
AUTOIONIZING-LIKE RESONANCES
NONLINEAR OPTICS
INVERSIONLESS AMPLIFICATION
PARAMETRIC GENERATION
COMPENSATING LOSSES
BACKWARD WAVES
GAS DRIFT
LASER
RADIATION
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