Assuming david is required, and a is required, and brock is required, the following result was found.
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Graduate Students as Untapped Resources
May 1994, 3. 5 W. Chris Lengefeld, "The Merits of Cooperation," CMS Newsletter, November 1994, 2 & 8. authors: David A. Brock author_ids: 1112 authors: David A. Brock author_ids: 1112