Smid, Michiel Algorithms and Complexity, MPI for Informatics, Max Planck Society;
MPI-I-91-103.pdf (Any fulltext), 10MB
Smid, M.(1991). Maintaining the minimal distance of a point set in polylogarithmic time (revised version) (MPI-I-91-103). Saarbrücken: Max-Planck-Institut für Informatik.