I did some navigating and found this article
Worth buying? Oil Search may look a touch expensive on traditional valuation measures, with price-to-earnings ratio in the mid-20s for the next couple of years. However, this premium is justified, given the company's attractive long-term growth prospects.
Put simply, there are relatively few petroleum companies in the market with such strong and clear growth opportunities as Oil Search.
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http://www.smh.com.au/news/money/hot-stock--oil-search/2008/05/12/1210444336098.html