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“Photoluminescence Characterization of Nonradiative Recombination Centers in Light Emitting Materials by Utilizing Below-Gap Excitation: A Mini Review of Two-Wavelength Excited Photoluminescence”, Rajshahi Univ. j. sci. eng., vol. 43, pp. 1–9, Dec. 2015, doi: 10.3329/rujse.v43i0.26158.