Spatial pattern analysis on individuals of Tilia tuan Szyszyl. at different altitudes in typical watershed of Beijing mountainous area
JIA Guodong, YU Xinxiao, DENG Wenping, LI Yajun
Ecology and Environment . 2011, (7): 996 -1002 .  DOI: 10.16258/j.cnki.1674-5906(2011)06-07-0996-07

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