[Dai, Dier; Liu, Huihuang] Hunan Univ, Coll Econ & Trade, Changsha, Hunan, Peoples R China.
[Liu, Huihuang] Hunan City Univ, Dept Econ, Yiyang, Peoples R China.
[Wu, Jiasheng] Hunan Univ, Coll Civil Engn, Changsha, Hunan, Peoples R China.
[Wu, Jiasheng] Hunan Univ, Key Lab Bldg Safety & Energy Efficiency, Minist Educ, Changsha, Hunan, Peoples R China.
[Dai, Dier] Hunan Univ, Dept Econ & Trade, North Campus, Changsha 410079, Hunan, Peoples R China.