In 1978, he wrote a paper describing a method to efficiently compute strongly connected members of a directed graph, a method later called Kosaraju's algorithm. Along with Paul Callahan, he published many articles on efficient algorithms for computing the well-separated pair decomposition of a point set. His research efforts include efficient algorithms for pattern matching, data structure simulations, universal graphs, DNA sequence assembly, derandomization and investigations of immune system responses.[2]
Callahan, Paul B.; Kosaraju, Sambasiva Rao (1992), "A decomposition of multidimensional point sets with applications to k-nearest-neighbors and n-body potential fields (preliminary version)", STOC '92: Proc. ACM Symp. Theory of Computing, ACM.