9Scharfstein, D. S. and J. C. Stein, "Herd Behavior and Investment", American Economic Review 80, 1990,465 - 479.
10Froot, K. , D. Scharfstein, and J. C. Stein, "Herd On The Street: Informational Inefficiencies in A Market With Short - Term Speculation", Journal of Finance 47,1992,1461 - 1484.