Schwarz, Christian Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Smid, Michiel Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Schwarz, C., Smid, M., & Snoeyink, J. (1992). An Optimal Algorithm for the On-line Closest-pair Problem. In Proceedings of the 8th Annual Symposium on Computational Geometry (pp. 330-336). New York, NY: ACM.