@Article{GuandongXu:2011,
  author = {Guandong Xu, Lin Li, Yanchun Zhang, Xun Yi, Masaru Kitsuregawa},
  title = {Modeling user hidden navigational behavior for Web recommendation},
  booktitle = {Web Intelligence and Agent Systems},
  year      = {2011},
  pages     = {pp.239-255},
}