Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Nievergelt, Bernhard","Ibexes in an African environment : ecology and social system of the Walia ibex in the Simen Mountains, Ethiopia",,Springer-Verlag,1981,Ecological studies : analysis and synthesis,,"0387105921,3540105921",,https://cir.nii.ac.jp/crid/1130000798374571264