Ho, P. (2001). "Rangeland Degradation in North China Revisited? A Preliminary Statistical Analysis to Validate Non-Equilibrium Range Ecology". The Journal of Development Studies. 37 (3): 99–133. doi:10.1080/00220380412331321991. ISSN0022-0388. S2CID154397243.
Ho, P. (2001). "Rangeland Degradation in North China Revisited? A Preliminary Statistical Analysis to Validate Non-Equilibrium Range Ecology". The Journal of Development Studies. 37 (3): 99–133. doi:10.1080/00220380412331321991. ISSN0022-0388. S2CID154397243.
Ho, P. (2001). "Rangeland Degradation in North China Revisited? A Preliminary Statistical Analysis to Validate Non-Equilibrium Range Ecology". The Journal of Development Studies. 37 (3): 99–133. doi:10.1080/00220380412331321991. ISSN0022-0388. S2CID154397243.