Carvalhinhos, A., Freire, A., Novais, L., Veloso, J., Urceira Lopes, M.J. and Pinto Correia, J. 1986. Value of manometry of the esophagus in the diagnosis of achalasia. Acta Médica Portuguesa. 7, 3 (Jun. 1986), 109–114. DOI:https://doi.org/10.20344/amp.3608.