↑The earliest finding is reported in 1739 and since then the count has mounted to 116 similar objects; Michael Guggenberger (2013), The Gallo-Roman Dodecahedron, The Mathematical Intelligencer, Vol. 35, Dec.2013, Iss. 4, pp 56–60
↑Kilford,L.J.P.(December 2004),“A Mathematical Tourist in Germany”,Mathematics Today40(6): 204
↑Sparavigna A., (2012) Roman Dodecahedron as dioptron: Analysis of freely available data, Arxiv,
↑Wagemans G.M.C., The Roman Pentagon Dodecahedron, An Astronomic Measuring Instrument for Determining the optimal sowing date for winter grain; this webpage also has a map of the distribution of the dodecahedra