By Yirga Solomon   in SINET: Ethiopian Journal of Science

ISSN:0379-2897|25|2|205-226

Faculty of Science, Addis Ababa, Ethiopia‎(2002)‎

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By Gebremedhin Berihun   Yirga Solomon   in SINET: Ethiopian Journal of Science

ISSN:0379-2897|28|2|161-170

Faculty of Science, Addis Ababa, Ethiopia‎(2005)‎

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By Gebre Berhanu   Yirga Solomon   in SINET: Ethiopian Journal of Science

ISSN:0379-2897|27|2|121-126

Faculty of Science, Addis Ababa, Ethiopia‎(2004)‎

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