引用本文: | 吕永安, 钟艳, 孙妍. 关于退耕还林还草若干问题的思考[J]. 北京林业大学学报(社会科学版), 2004, 3(1): 34-37. |
Citation: | Lü Yong’an, Zhong Yan, Sun Yan. Pondering on Problems in Reverting Farmland to Forests and Grassland[J]. Journal of Beijing Forestry University (Social Science), 2004, 3(1): 34-37. |