Carvalhinhos, A., Freire, A., Novais, L., Urceira Lopes, M.J., Veloso, J. and Pinto Correia, J. 1986. Long-term monitoring of esophageal pH (24-hour pH test). Technic and clinical application. Acta Médica Portuguesa. 7, 1 (Feb. 1986), 25–33. DOI:https://doi.org/10.20344/amp.3587.