4Bricongne, J. -C. , Fontagn'e, L. , Gaulier, G. , Taglioni, D. , and Vicard, V. , Firms and the global crisis: French exports in the turmoil [ J ]. Banque de France Working Paper 265, 2009.
5Raddatz. and Claudio, "Credit Chains and Sec- toral Comovement: Does the Use of Trade Credit amplify Sectoral Shocks?" [ J]. Review of Economics and Statistics, 2009.
6Levchenko, A., Lewis, L., and Tesar, L., The collapse of international trade during the 2008 -2009 crisis : In search of the smoking gun [ J ]. NBER Working Paper No. 16006, May 2010.
7Jonathan Eaton, Samuel Kortum, Brent Neiman, and John Romalis, sion [ J ] . NBER Working 2011. Trade and the Global RecesPaper No. 16666, January.
8Levchenko, A., Lewis, L., and Tesar, L., The "Collapse in Quality" Hypothesis, The American E- conomic Review, May 2011, pp. 293 - 297.
9David Hummels, Jun Ishii, and Kei - Mu Yi, The Nature and Growth of Vertical Specialization in World Trade, 1999.