Astronomy and Basque Language, Henrike Knörr, Oxford VI and SEAC 99 «Astronomy and Cultural Diversity», La Laguna, June 1999. Ён спасылаецца на Alessandro Bausani, 1982, The prehistoric Basque week of three days: archaeoastronomical notes, The Bulletin of the Center for Archaeoastronomy (Maryland), v. 2, 16-22. (англ.)
