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1by Abose, Terekegn, Yeebiyo, Yemane autor/a, Olana, Dereje autor/a, Alamirew, Desta autor/a
Published 1998Texto bibliotecaECOSUR -
2by Abose, T., WHO, Geneva (Switzerland). Div. of Control of Tropical Diseases eng, Yeebiyo, Y., Olana, D., Alamirew, D., Beyene, Y., Regassa, L., Mengesha, A.
Published 1998Texto bibliotecaFAO IT