D. Gadiye, G. W. Eshiamwatta, and W. O. Odadi, “Spatial-temporal distribution of the black rhino population in the Ngorongoro Crater, Tanzania”, IJBR, vol. 4, no. 2, pp. 232–236, Sep. 2016, doi: 10.14419/ijbr.v4i2.6659.