Pathways of degradation in rangelands in Northern Tanzania show their loss of resistance, but potential for recovery oleh Joris H. Wiethase, Rob Critchlow, Charles Foley, Lara Foley, Elliot J. Kinsey, Brenda G. Bergman, Boniface Osujaki, Zawadi Mbwambo, Paul Baran Kirway, Kelly R. Redeker, Susan E. Hartley, Colin M. Beale