%A Zhenming Wang
%J Seismological Research Letters
%T Comment on "Sigma: Issues, Insights, and Challenges" by F. O. Strasser, N. A. Abrahamson, and J. J. Bommer
%N 3
%P 491-493
%V 80
%D 2009
%I Seismological Society of America
%R doi:10.1785/gssrl.80.3.491
%L epos1316