7Ana Lucfa Coronel, Dmitriy Rozhkov, Ali AI-Eyd and Narayanan Raman. 2011. Republic of Kazakhstan: Selected Issues[R]. IMF Country Report No. 11/151.
8Alejandro Ibarra-Yunez. 2003. Spaghetti Regionalism or Strategic Foreign Trade: Some Evidence for Mexico[R]. NBER Working Paper 9692.http://www.nber.org/papers.
9Bbagwati, J., D. Greenway, and A. Panagariya. 1998. Trading Preferentially: Theory and Policy [J]. The Economic Journal.
10Fan Zhal. 2006. Preferential Trade agreements in Asia: Alternative Scenarios of "Hub and Spoke" [R]. ERD Working paper:83. ADB. Manila, Philippines.
