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Source:
Nature. 10/21/1993, Vol. 365 Issue 6448, p735. 3p. 2 Color Photographs, 1 Chart.
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Source:
Nature. 7/29/1993, Vol. 364 Issue 6436, p391. 2p. 2 Color Photographs, 1 Diagram.
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Source:
Industry Week/IW. 8/2/93, Vol. 242 Issue 15, p44. 1/8p.
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Source:
New York Times. 8/31/93, Vol. 142 Issue 49440, pC1.
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Source:
Nature. 10/21/1993, Vol. 365 Issue 6448, p690. 1p. 1 Color Photograph.
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