Received for publication 8 Sept. 1987. Approved for publication by the Director of the Louisiana Agricultural Experiment Stations as manuscript no. 87-28-1441. We gratefully acknowledge the valuable assistance of Marc Cohn in the review and preparation of this manuscript. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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