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May 8, 2013 /PRNewswire/ --
Bernstein Liebhard LLP is investigating whether the Board of Directors of Pioneer Southwest Energy Partners L.P. ("Pioneer Southwest" or the "Company") (NYSE: PSE) is breaching its fiduciary duty to its shareholders in connection with a proposed transaction to sell Pioneer Southwest to Pioneer Natural Resources Company ("Pioneer") (NYSE: PXD), the majority shareholder of Pioneer Southwest.