请问有没有朋友可以帮忙查查。估计JISTOR上面的文章,但我们学校上不了JISTOR

1 Singer,H.W.1999 Beyond Terms of Trade:Convergence and Divergence. Journal of International Development 11(6)p911-916.

2 Sen Partha Terms of Trade and Welfale for a Developing Economy with an Imperfectly Competitive Sector 《Review of Development Economics》 1998 / 2 / P 87-93
3 Singer H W Beyond Terms of Trade:Convergence and Divergenc 《Journal of International Development》 1999 / 11 / P 911-916
4 Singer H W The Distribution of Grains between Investing and Borrowing Countrise 《American Economic Review》 1950 / / P

可以吗？ 谢谢！！（my e-mail: kookaburra_kk@163.com）