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Charney, D.H., Reder, L.M., & Wells, G.W. (1988). Studies of elaboration in instructional texts. In S. Doheny-Farina (Ed.), Effective documentation: What we have learned from research, Cambridge, Mass: MIT Press, 47-72.
Note: Above paper was the winner of the 1989 NCTE Award for Excellence in Technical and Scientific Writing: Best Article Reporting Formal Research in Technical or Scientific Communication.