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        Journal: Crystals, 2023
        Volume: 13 
                	Number: 101 
                
        
        Article:
        Improving the Directionality of Low-Frequency Acoustic Radiation by a Finite Array of Quadrupolar Sources with Acoustic Metamaterials 
        Authors: 
       	by
                    Qinglei Zeng, Shenlian Gao, Yun Lai and Xiaozhou Liu        
        Link:
        https://www.mdpi.com/2073-4352/13/1/101
        
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