But see Lukas Rösli's questioning of this evidence, providing a paratextual analysis of the steps that led to this authorial attribution. Rösli, Lukas. "From Schedæ Ara Prests Fróða to Íslendingabók – When an Intradiegetic Text Becomes Reality". The Meaning of Media: Texts and Materiality in Medieval Scandinavia, edited by Anna Catharina Horn and Karl G. Johansson, Berlin, Boston: De Gruyter, 2021, pp. 173-214. https://doi.org/10.1515/9783110695366-009