Navarro Jurado, E., and C. Carvajal Gutiérrez. “Retired Foreigners: Unregistered Residents or Residential Tourists? Methodology for the Quantification of the Unregistered Population”. BAETICA. Estudios De Historia Moderna Y Contemporánea, no. 31, May 2015, pp. 61-90, doi:10.24310/BAETICA.2009.v0i31.169.