Istituto di Scienza e Tecnologie dell'Informazione     
Arioli M., Duff I., Storer N. Subroutine library specification. Gia' apparsa come Harwell Laboratory, MC33, April 1988. Internal note IEI-B4-34, 1988.
This subroutine finds row and column permutations that reorder an mxn sparse matrix to a bordered block triangular form with full diagonal blocks, or a nested bordered block triangular form with each block itself in bordered block triangular form.

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