B:24 “On Parts of Parts and Ascending Continued Fractions”. Centaurus 33 (1990), 293–324. Manuscript of preprint.




 The 'Unknown Heritage': trace of a forgotten locus of mathematical sophistication. Archive for history of Exact Sciences 62 (2008), 613-654. DOI 10.1007/s00407-008-0025-y. Preprint.



“Sub‑scientific Mathematics: Undercurrents and Missing Links in the Mathematical Technology of the Hellenistic and Roman World”. Filosofi og videnskabsteori på Roskilde Universitetscenter. 3. Række: Preprints og Reprints 1990 nr. 3. Forthcoming in Aufstieg und Niedergang der römischen Welt, II vol. 37,3 (if that volume should ever happen to appear!). Manuscript.



«Les quatre côtés et l'aire» – sur une tradition anonyme et oubliée qui a engendré ou influencé trois grandes traditions mathématiques savantes”, pp. 507–531 in Histoire et épistémologie dans l'éducation mathématique. Actes de la première Université d'été européenne, Montpellier 10 au 13 juillet 1993. Montpellier: IREM de Montpellier, 1995. The publisher having omitted proof-reading, the article contains some 270 errors, including wrong formulae and skipped passages. Corrected republication pp. 192224 in E. Gallo, L. Giacardi & C. S. Roero (eds), Associazione Subalpina Mathesis. Seminario di Storia delle Matematiche Tullio Viola. Conferenze e Seminari 19951996. Torino: Associazione Subalpina Mathesis, 1996. Manuscript for the republication.



Lasciti sotto-scientifici alla matematica d'abbaco: quasi algebra ed altre strane specie / The Sub-Scientific Heritage in `abbaco´-Mathematics: Quasi-Algebra and Other Queer Species”. L'educazione matematica 22 (2001), 23-39, 94-103, 149-158.



 “Sanskrit-Prakrit Interaction in Elementary Mathematics as Reflected in Arabic and Italian Formulations of the Rule of Three – and Something more on the Rule Elsewhere. Ganita BhāratÌ 34 (2012; actually 2014), 144172.


 “Advanced Arithmetic from Twelfth-Century Al-Andalus, Surviving Only (and Anonymously) in Latin Translation? A Narrative That Was Never Told”. Contribution to the Conference “Narratives on Translation”, Max-Planck Institut für Wissenschaftsgeschichte, Berlin, 16–20 November 2015. . Roskilde University, 23.11.2015.



[Review of B. L. van der Waerden, Geometry and Algebra in Ancient Civilizations. Berlin etc.: Springer Verlag, 1983]. Zentralblatt für Mathematik 0534.01001.