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Observation of Exciton-Polariton Emissions from a ZnO Epitaxial Film on the a-Face of Sapphire Grown by Radical-Source Molecular-Beam-Epitaxy, Chichibu, Shigefusa F., Sota, Takayuki, Fons, Paul J., Iwata, Kakuya, Yamada, Akimasa, Matsubara, Koji, Niki, Shigeru
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Chichibu et al. (2002) studied this question.
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