地理学报
The Spatial Distribution of Heavy Metals in the Urban Topsoil Collected from the Interior Area of the Second Ring Road, Xi'an
CHEN Xiuduan, LU Xinwei, ZHAO Caifeng, LUO Dacheng
Acta Geographica Sinica . 2011, (9): 1281 -1288 .  DOI: 10.11821/xb201109013