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    David H. Jonassen (2)
    David J. Dempsey, JD (2)
    David J. Lieberman, Ph.D (2)
    David J. Lieberman, Ph.D. (2)
    DAVID J. SCHWARTZ, PH.D. (2)
    DAVID J. ~CHWARTZ, PH.D. (2)
    DAVID J.LIEBERMAN, PH.D. (2)
    DAVID KAY AND ROGER HINDS (2)
    David L. Rennie (2)
    David Lawrence Preston (2)