Comparing the oldest collection of Turkish riddles, those found in a section of the 14th-century Codex Cumanicus, with related riddles from other Turkic sources, he described a new vision of this early work in "The Koman Riddles and Turkic Folklore".
Davud Monshizadeh, Das Persische im Codex Cumanicus, Uppsala: Studia Indoeuropaea Upsaliensia, 1969.
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