[1]龚直文,亢新刚,杨华,等.长白山杨桦次生林直径结构研究[J].西北林学院学报,2009,24(03):1. GONG Zhi-wen,KANG Xin-gang,YANG Hua,et al.Diameter Structure of Polar-Birch Secondary Forests in Changbai Mountain[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2009,24(06):1.