Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yuuki Kasai and Kenji Tsuruta and Kazuhiro Fujimori,Negative refraction and energy-transmission efficiency of acoustic waves in two-dimensional phononic crystal: numerical and experimental study,Japanese journal of applied physics : JJAP,00214922,Tokyo : The Japan Society of Applied Physics,2011-06,50,6,,https://cir.nii.ac.jp/crid/1520572358397908352,