\addcontentsline{toc}{section}{Acknowledgments}
\section*{Acknowledgments}

We acknowledge Wing-Lok Wan for the monumental summer 
project of adapting the incomplete Cholesky 
factorization to the incomplete LU case.
We thank William Gropp for his help with the MPI
message-passing implementation and for his inspiration
on a large number of software issues.
We thank Lois Curfman McInnes, Barry Smith, and the 
PETSc team for the makefile facilities, motivation
for conversion to ANSI-C, help with the documentation
and testing, and numerous suggestions for
improving the software.
We also thank Satish Balay for discussions
on the implementations of the required BLAS macros.

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