@article {200701,
	title = {The Theory of Trade in Middle Products: Extension},
	journal = {American Economic Review},
	year = {1984},
	url = {http://www.jstor.org/discover/10.2307/1804024?uid=3739696\&uid=2\&uid=4\&uid=3739256\&sid=21104696870923},
	author = {Jeffrey Frankel}
}
