Superradiance problem in a 3D annular domain
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1.
Department of Mathematical Sciences, The University of Texas- El Paso, El Paso, Texas 79968-0514
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2.
College of Mathematics and Statistics, Chongqing University, Chongqing 400044
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3.
College of Mathematics and Computers, Changsha University of Science and Technology, Changsha, Hu'nan 410076