Published Online: Apr 03, 2012
Page range: 5 - 6
DOI: https://doi.org/10.2478/v10117-012-0011-y
This content is open access.
Asfawossen Asrat
Department of Earth Sciences, Addis Ababa University, Addis Ababa, Ethiopia
Zbigniew Zwoliński
Institute of Geoecology and Geoinformation, Adam Mickiewicz University, Poznań, Poland