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2. Murle grammar. Occassional Papers in the Study of Sudanese Languages 2;Arensen,1982
3. The Surma language group: A preliminary report;Bender;Studies in African Linguistics,1977
4. Ergative word order - Luwo is OVS;Buth,1981
5. Outlines of a Nuer Grammar;Crazzolara,1933