Xinbao Zhang, Timothy A. Quine, Desmond E. Walling, Zhou Li, Application of the Caesium-137 Technique in a Study of Soil Erosion on Gully Slopes in a Yuan Area of the Loess Plateau near Xifeng, Gansu Province, China, Geografiska Annaler. Series A, Physical Geography, Vol. 76, No. 1/2 (1994), pp. 103-120
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Zhang et al. (1994) studied this question.