By Taye Girma   in Statistics

ISSN:0233-1888|42|3|275-289

Taylor & Francis Ltd‎(2008)‎

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By Agegnehu Getachew   Taye Girma   in SINET: Ethiopian Journal of Science

ISSN:0379-2897|27|1|17-24

Faculty of Science, Addis Ababa, Ethiopia‎(2004)‎

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