P. Gilbert Geroski (Geroski, P. Gilbert)

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  Barriers to Entry and Strategic Competition
  by Alexis Jacquemin, P. Gilbert Geroski
  Hardcover, Routledge, ISBN 0415269210 (0-415-26921-0)
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  Barriers to Entry and Strategic Competition
  by Richard Gilbert, Alexis Jacquemin, P. Gilbert Geroski
  Softcover, Harwood Academic Pub, ISBN 3718650304 (3-7186-5030-4)