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| | Shafick |
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 | | 1995 Y. Wu, Jianxiong Qin, Boqing Wu, Xianfeng, Sun “Simulation of Element Migration in Purple Soil and its Correlation with Peach Yellowing in the Peach Orchard of Longquanyi District,Chengdu”, Joural of Chengdu Institute of Technology, PRC, 1995 Vol.22, No.3, P91~95. |
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| www.science.uwc.ac.za /earthscience/ywu.htm (601 words) |
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