Picado, Jorge; Silva, Pedro M. In search of unity: Galois connections and Möbius-Rota inversions. (Portuguese. English summary) Zbl 1446.06008 Bol. Soc. Port. Mat. 76, 57-88 (2018). MSC: 06A15 05A15 PDFBibTeX XMLCite \textit{J. Picado} and \textit{P. M. Silva}, Bol. Soc. Port. Mat. 76, 57--88 (2018; Zbl 1446.06008)
Mendes Martins, Paula; Picado, Jorge Analysis of a game of solitaire using the Galois field \(\mathrm{GF}(4)\). (Portuguese. English summary) Zbl 1457.00004 Bol. Soc. Port. Mat. 69, 51-58 (2013). MSC: 00A08 PDFBibTeX XMLCite \textit{P. Mendes Martins} and \textit{J. Picado}, Bol. Soc. Port. Mat. 69, 51--58 (2013; Zbl 1457.00004) Full Text: Link
Lopes, Domingos; Picado, Jorge The algebra of tangles. (Portuguese. English summary) Zbl 1116.57006 Bol. Soc. Port. Mat. 54, 29-69 (2006). MSC: 57M25 PDFBibTeX XMLCite \textit{D. Lopes} and \textit{J. Picado}, Bol. Soc. Port. Mat. 54, 29--69 (2006; Zbl 1116.57006)