Oliveira, Pedro Aires2018-03-222018-03-222015-061645-9199PURE: 1206112PURE UUID: c701518c-39e7-4df6-884f-2be2c301cbb3http://www.scielo.mec.pt/pdf/ri/n46/n46a10.pdfUID/HIS/04209/20134125212porreviewhttp://www.scielo.mec.pt/pdf/ri/n46/n46a10.pdf