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        Journal: Mathematics, 2021
        Volume: 9 
                	Number: 199 
                
        
        Article:
        Recovering Density and Speed of Sound Coefficients in the 2D Hyperbolic System of Acoustic Equations of the First Order by a Finite Number of Observations 
        Authors: 
       	by
                    Dmitriy Klyuchinskiy, Nikita Novikov and Maxim Shishlenin        
        Link:
        https://www.mdpi.com/2227-7390/9/2/199
        
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