BIBLIOGRAPHY CONTRIBUTOR R.O. Besthorn First name R.O. Last name Besthorn Bibliography entries by this contributor 1893. Codex Leidensis 399,1. Euclidis Elementa Ex Interpretatione Al-Hadschdschadschii Cum Commentariis Al-Nairizii. Eds. R.O. Besthorn and Heiberg, J.L. 3 vol.. Copenhagen: Gyldendel.