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Benmerkhi, A. , Bounouioua, A. , Bouchemat, M. , Bouchemat, T.. "Study of Photonic Crystal Band Gap and Hexagonal Microcavity Based on Elliptical Shaped Holes". World Academy of Science, Engineering and Technology, Open Science Index 167, International Journal of Chemical and Molecular Engineering (2020), 14(11), 257 - 260.