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The following are corrections to this paper which appeared in February 2001. In Section 3.3.5, where we described the algorithm, called Actions at process$P_i$, on receiving a computation message from$P_j$, we have discovered an error in a math equation. The fourth line in this action:

    G. Cao is with the Department of Computer Science and Engineering, Pennsylvanis State University, University Park, PA 16802.


    M. Singhal is with the Department of Computer and Information Science, Ohio State University, Columbus, OH 43210.


Manuscript received 1 Mar. 2000; revised 1 Aug. 2000; accepted 15 Aug. 2000.

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