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Chemistry. 1988, 53 (14): 3184–3190. doi:10.1021/jo00249a011. Whitlock, HowardW.; Smith, Gary Lee. Total synthesis of DL-crinine. Journal of the American Chemical
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Computer Age (HarperCollins, New York, 1999) ISBN 0-88730-989-5 Douglas K. Smith, Robert C. Alexander, Fumbling the Future: How Xerox Invented, Then Ignored