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        Journal: Sensors, 2021
        Volume: 21 
                	Number: 1661 
                
        
        Article:
        Monophonic and Polyphonic Wheezing Classification Based on Constrained Low-Rank Non-Negative Matrix Factorization 
        Authors: 
       	by
                    Juan De La Torre Cruz, Francisco Jesús Cañadas Quesada, Nicolás Ruiz Reyes, Sebastián GarcÃa Galán, Julio José Carabias Orti and Gerardo Peréz Chica        
        Link:
        https://www.mdpi.com/1424-8220/21/5/1661
        
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