THX!

Title: Energy security: externalities and policies
Author: Douglas R. Bohia and Michael A. Toman
source: energy policy
Volume 21, Issue 11, November 1993, Pages 1093-1109
link:   http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V2W-48XK43D-1J4&_user=1154138&_coverDate=11%2F30%2F1993&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1451508574&_rerunOrigin=scholar.google&_acct=C000051813&_version=1&_urlVersion=0&_userid=1154138&md5=a5f204477c47d80fc5442525dee39efa&searchtype=a