Gamella, Juan F., et al. «New Methodological Approaches in the Anthropological Demography of Romani Groups : An Example from the Study of the Evolution of the Infant and Child Mortality of the Gitanos or Calé of Spain (1871-2007)». Sociologia: Revista Da Faculdade De Letras Da Universidade Do Porto, Maio de 2017, http://84.247.136.72/ojsletrasX/index.php/Sociologia/article/view/2272.