Authors
Tilahun Ferede Asena
School of Mathematical and Statistical Sciences, Hawassa University,, Hawassa, Ethiopia
Ayele Taye Goshu
School of Mathematical and Statistical Sciences, Hawassa University,, Hawassa, Ethiopia
© 2017 Tilahun Ferede Asena, Ayele Taye Goshu, published by Polish Biometric Society
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.