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• https://etd.aau.edu.et/items/1a9f9fb7-2663-42b9-b694-8a96d0349b18
• https://etd.aau.edu.et/items/289f0f76-c65f-4f41-863c-fe30333b1648
• https://etd.aau.edu.et/items/77e1abd7-eaab-4d79-8f35-eb0ac013f227
• https://etd.aau.edu.et/items/bb8d51ee-fd90-4641-bb07-fada86ae7b9f
• https://etd.aau.edu.et/items/2349387a-b5c1-4b47-8436-2937098ff11d
• https://etd.aau.edu.et/items/6541f371-d28b-49c0-a847-c06bf1e799f7
• https://etd.aau.edu.et/items/8aa147cc-62e4-4459-b8aa-885b3297b453
• https://etd.aau.edu.et/items/98ae2c9d-2f77-428e-9b57-94bb03573c11
• https://etd.aau.edu.et/items/95d24af8-ef5b-425b-9a60-a86f6fefb14e
• https://etd.aau.edu.et/items/4324ac9c-924c-4eb5-bf3e-b91e10f4874c
• https://etd.aau.edu.et/items/580d6bd1-1a5a-41b6-ae3e-c9cbe530f2b1
• https://etd.aau.edu.et/items/796853be-bf92-45cc-b687-2ea94896f1df