L. Alves Ribeiro, J. Andronio Ramundo Staduto, R. Manuel de Sousa Fragoso, and M. Conceição Peixe Rego, “Regional Inequalities in Employment in Portugal: An Approach Based on the Location Quotient and the Hirschman-Herfindahl Index”, Rev. Port. de Estud. Reg., no. 76, pp. 65–82, Oct. 2026.