Optical and Quantum Electronics · 1991 · 48 citations · 22 references
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Infrared Lattice Absorption in Ionic and Homopolar Crystals
M. Lax, Elias Burstein · Physical Review · 1955 · 399 citations
Proposed Negative-Mass Microwave Amplifier
Herbert Krömer · Physical Review · 1958 · 113 citations