Lourenço, R. A.; Martins, C. de S. F.; Sanchez, M. A. S.; Veras, R. P. Geriatric Outpatient Healthcare: Hierarchical Demand Structuring . Rev. saúde pública 2005, 39 (2), 311-318. https://doi.org/10.1590/S0034-89102005000200025.