Brunori, Paola; Magrone, Paola; Lalli, Laura Tedeschini (2018 թ․ հուլիսի 7), «Imperial Porphiry and Golden Leaf: Sierpinski Triangle in a Medieval Roman Cloister», Advances in Intelligent Systems and Computing (անգլերեն), Springer International Publishing: 595–609, doi:10.1007/978-3-319-95588-9_49, ISBN9783319955872