1. Chen Y E, Liu K, Li W H. 1995. Clear-cutting and root-sprout regeneration is an efficient way for large-scale reforming of black locust forest. Bulletin of Soil and Water Conservation. 15(6): 64–68
2. Chen Y Z. 1981. Investigation of widespread death due to dry for man-made forests in Bashang. Hebei Forestry Technology. 4: 12–17
3. Hou Q C, Huang X, Han S F, Zhang X Z. 1991. Study on the forming of “small old tree” and the transforming way in the Loess Plateau I. The distribution and growth nature of the small old tree. Journal of Soil and Water Conservation. 1(5): 64–72
4. Qi C J. 1991. Low-benefit black locust transforming technique research. Journal of Liaoning Forestry Science & Technology. 4: 26–29
5. Qi S D, Luo H N, Cheng L J. 1991. The character and transforming technique of low-benefit forest in Wujiang River. Symposium of Protection Forest Construction in Mid- and Up-river of Yangtze River. Beijing: China Forestry Publishing House. 349–353