Ferroelectret-based Hydrophone Employed in Oil Identification - A Machine Learning Approach. - Daniel Rodrigues de Luna; T. T. C. Palitó; Y. A. O. Assagra; Ruy Alberto Pisani Altafim; João Paulo Carmo; Ruy Alberto Correa Altafim; Antonio Adilton Oliveira Carneiro; Vicente A. de Sousa Jr. (Sensors, 2020)