作者:VATTER, WJ
作者单位:University of California System; University of California Berkeley
作者:TUTTLE, DL; LITZENBERGER, RH
作者单位:University of North Carolina; University of North Carolina Chapel Hill
作者:BERNEY, RE
作者单位:Washington State University
作者:GIBB, WT
作者单位:United States Department of the Treasury