1. A Hora Dos Direitos Dos Animais;Araújo,2003
2. The recent development of Portuguese law in the field of animal rights;Araújo;J. Anim. Law,2005
3. Constitutional and Legislative Aspects of Animal Welfare in Europe;Bolliger,2007
4. Measuring animal welfare: what can cognition contribute?;Brydges;ARBS Annu. Rev. Biomed. Sci.,2008