A simple parallel algorithm for the single-source shortest path problem on planar digraphs - Träff, Jesper L.; Zaroliagis, Christos D. (Lecture Notes in Computer Science ; Parallel Algorithms for Irregularly Structured Problems ; page 183-194 ; ISSN 0302-9743 1611-3349 ; ISBN 9783540615491 9783540688082, 1996)