de Oliveira Dias, Ana. “‘Commentarium in Apocalypsin’. Number and Geometric Form in the Illustrations of the «Beatus» of Saint Mamas of Lorvão”. Eikón / Imago, vol. 4, vol. 4, no. 2, 2015, pp. 211-0, doi: https://doi.org/10.5209/eiko.73470.