Chaudhuri, Shiva Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Zaroliagis, Christos Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Chaudhuri, S., & Zaroliagis, C. (1998). Shortest paths in digraphs of small treewidth. Part II: Optimal parallel algorithms. Theoretical Computer Science, 203(2), 205-223.