Nuno Luís Madureira https://www.cepese.pt/portal%22%22%22%22/en/publications/authors/nuno-luis-madureira https://www.cepese.pt/portal%22%22%22%22/@@site-logo/CEPESE+home.png Nuno Luís Madureira Artigos Opportunity and Chance: The Introduction of Sampling Techniques in Portugal 2003