Two articles of mine have recently been published in academic journals. Both provide an in-depth analysis of some of the issues covered in this blog, and may therefore be of interest to you:

Duncan Simpson, ‘Approaching the PIDE “From Below”: Petitions, Spontaneous Applications and Denunciation Letters to Salazar’s Secret Police in 1964’, in Contemporary European History, 2020, https://doi.org/10.1017/S0960777320000612Duncan Simpson, ‘The PIDE Between Memory and History: Revolutionary Tradition, Historiography, and the Missing Dimension in the Relation Between Society and Salazar’s Political Police’, in e-Journal of Portuguese History, 18.1, 2020, pp. 17-38, https://repository.library.brown.edu/studio/item/bdr:1161228/