العربية: طابع خاص من فئة 4 كوبيك من الاتحاد السوفييتي السابق بتاريخ 6 سبتمبر 1989 بمناسبة الذكرى الـ 1200 لميلاد أبو عبد الله محمد بن موسى الخوارزمي
Deutsch: Sonderbriefmarke zu 4 Kopeken der ehemaligen Sowjetunion vom 6. September 1989 zum 1200sten Geburtstag von Abu Abdullah Muhammad bin Musa al-Khwarizmi (persisch: أبو عبد الله محمد بن موسى خوارزمي ).
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According to the Russian copyright law of 1993 (Федеральный закон от 9.07.1993 № 5351-1), the following item is not subject to copyrights. It is a state symbols or tokens (which include flags, coats of arms, orders, banknotes and other state symbols and tokens).
This image (or derivatives) has been widely reproduced in printed books, including:
Michiel Keelstra. Een cultuurgeschiedenis van de wiskunde. Nieuwezijds: November 2006. ISBN9057121360.
Corona Brezina. Al-Khwarizmi: The Inventor Of Algebra. (Great Muslim Philosophers and Scientists of the Middle Ages) ISBN1404205136.
{{Information |Description=Source: [http://jeff560.tripod.com/], specifically [http://jeff560.tripod.com/khowar.jpg] == Related images == <gallery> Image:Abu Abdullah Muhammad bin Musa al-Khwarizmi edit.png Image:Abu Abdullah Muhammad bin Musa al-Khwariz