2Blanchard O. J. , Watson M. W.. A Specification Test for Speculative Bubbles. Working Paper No. 945,1982.
3Etienne X. L. , Irwin S. H. , Garcia P.. Price Explosiveness, Speculation, and Grain Futures Prices,2014 ( 8 ) : 1 - 22.
4Evans G. W.. Pitfalls in Testing for Explosive Bubbles in Asset Prices. The American Economic Review, 1991,81 (4) : 922 - 930.
5Gilbert C. K. Speculative Influences on Commodity Futures Prices 2006-2008. United Nations Conference on Trade and Development, Unctad Discussion Papers,2010 : 197.
6Gutierrez L. Speculative Bubbles in Agricultural Commodity Markets. European Review of Agricultural Economics,2013,40 (2) : 217 - 238.
7Homm U. , Breitung J.. Testing for Speculative Bubbles in Stock Markets: A Comparison of Alternative Methods. Journal of Financial E- conometrics,2011,10( 1 ) : 198 -231.
8Irwin S. H. ,Etienne X. L ,Garcia P.. Bubbles in Food Commodity Markets: Four Decades of Evidence. Journal of International Money and Finance ,2013,42 : 129 - 155.
9Liu X., Filler G., Odening M.. Testing for Speculative Bubbles in Agricultural Commodity Prices: a Regime Switching Ap- proach. Agricultural Finance Review ,2013,73 ( 1 ) : 179 - 200.
10Phillips P. C. B. , Magdalinos T.. Limit Theory for Moderate Deviations from a Unit Root. Journal of Econometrics ,2007,136( 1 ) : 115 - 130.