@article{Liu92,
author = "J. W. H. Liu",
journal = "SIAM Review",
note = "First papers on the multifrontal technique go back to
                   1983",
pages = "82-109",
title = "{T}he multifrontal method for sparse matrix solution:
                   {T}heory and practice",
volume = "34",
year = "1992",
}