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Santiago Montoya-Ospina and  Raúl E. Jiménez-Mejía and  Rosa Elvira Correa Gutiérrez,  Experimental Approach for Determining Hemi-Anechoic Characteristics of Engineering Acoustical Test Chambers.  [online]. World Academy of Science, Engineering and Technology. September 2018, vol. 12(9). 1110 - 1114[viewed 24 November 2017]. Available from: http://waset.org/abstracts/82392 .