@Article{BotaoWang:2013,
  author = {Botao Wang, Jingwei Qu, Xiaosong Wang, Guoren Wang, Masaru Kitsuregawa},
  title = {VGQ-Vor: extending virtual grid quadtree with Voronoi diagram for mobile k nearest neighbor queries over mobile objects},
  booktitle = {Frontiers of Computer Science},
  year      = {2013},
  pages     = {44-54},
}