Guimarães, Aldo Marçal, Adriane Wosny Guimarães, Amanda Wosny Guimarães, Carla Maria Lima Olivi, Clara Ozeny Lima Olivi, Ana Paula Santos Oliveira Brito, Rafael Oliveira Chaves, et al. 2020. “Development of a Portable Prototype: PH Meter for Prolonged Esophageal PH Monitoring With Low Cost Materials”. International Journal of Advanced Engineering Research and Science 7 (4). https://journal-repository.com/index.php/ijaers/article/view/1832.