8Herfindahl, O.C.. Concentration in the U.S. Steel Industry[ Z]. New York:Columbia University, 1950. From Curry and George, 1983.
9Hirschman, A.O.. National Power and the Structure of Foreign Trade[ M]. University of California Bureau of Business & Economic Research, Berkeley, 1945. From Curry and George, 1983.
10Bain, Joe S.. Relation of Profit Rate to Industry Concentration: American Manufacturing, 1936 -1940[ J]. The Quarterly Journal of Economics, Aug 1951, Vol. 65, No. 3:293 - 324.