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Warren Buffett's Berkshire Hathaway buys $590 million in Occidental Petroleum shares - Houston Business Journal
Warren Buffett's firm buys more Occidental Petroleum and now owns more than 25% of the oil producer | AP News
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warren buffett portfolio: Here's why Warren Buffett loves oil giant Occidental Petroleum - The Economic Times
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Warren Buffett achète toujours plus d'actions Occidental Petroleum : il possède désormais un quart de la compagnie pétrolière - Business AM
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