Omār Khayyām lä el Encyclopaedia Britannica (2007; pekonsulton tü 2007 yunul 9). In sikloped at nem omik pamänioton Ghiyath al-Din Abu al-Fath 'Umar ibn Ibrahim al-Nisaburi al-Khayyami, e "matematan" palisedon bü "poedan".
st-and.ac.uk
www-groups.dcs.st-and.ac.uk
Omār Khayyām lä bevüresodatopäd: The MacTutor History of Mathematics archive.
