6Giancarlo, M.: Testing for Preference Change in Consumer Demand: An Indirectly Separable, Semiparametric Model, Journal of Business & Economic Statistics, 9( I ): 111-117, 199 1. 被引量:1
7Yang, K.: A Preliminary Study on the Use of Mobile Phones amongst Migrant Workers in Beijing, Knowledge, Technology & Policy, 21(5): 65-72, 2008. 被引量:1