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Negative Refractive Index in an Inhomogeneously Broadened Four-Level Inverted-Y Atomic Medium
Authors: Nguyen Huy Bang , Nguyen Van Phu, Vu Ngoc Sau, Nguyen Thanh Cong, and Le Van Doai
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: VOL. 13, NO. 6, DECEMBER 2021     : 2200407
Publishing year: 10/2021