Toward efficient unstructured multigrid preprocessing (extended abstract) - Dorward, Susan E.; Matheson, Lesley R.; Tarjan, Robert E. (Lecture Notes in Computer Science ; Parallel Algorithms for Irregularly Structured Problems ; page 105-118 ; ISSN 0302-9743 1611-3349 ; ISBN 9783540615491 9783540688082, 1996)