Ferroelectret-based hydrophone employed in oil identification - a machine learning approach - Luna, Daniel R. de; Palitó, T. T. C.; Assagra, Y. A. O.; Altafim, Ruy Alberto Pisani; Carmo, João Paulo Pereira do; Altafim, Ruy Alberto Corrêa; Carneiro, Antonio Adilton Oliveira; Sousa Junior, Vicente A. de (Sensors, 2020)