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[8322] Hassen, Mohammed (1996) : A brief glance at the history of the growth of written Oromo literature
[8321] Hassen, Mohammed & Richard J. Hayward (1980) : Linguistic evidence in an aspect of Oromo history: some innovations involving glides
[8371] Hayward, Richard J. & Mohammed Hassen (1981) : The Oromo orthography of Shaykh Bakri Sapato