@techreport{NBS (National Bureau of Statistics of China)2011a,
author = {NBS (National Bureau of Statistics of China)},
title= {The Sixth National Census Bulletin No. 1},
year = {2011a},
URL = {http://www.stats.gov.cn/tjfx/jdfx/t20110428_402722253.htm (April 2011, in Chinese)},
}