@Article{PhysRevE.90.032804,
  author = {Ke, Qing and Ahn, Yong-Yeol},
  title  = {Tie strength distribution in scientific collaboration networks},
  journal = {Phys. Rev. E},
  year   = {2014},
  number = {3},
  url    = {http://link.aps.org/doi/10.1103/PhysRevE.90.032804},
  doi = {10.1103/PhysRevE.90.032804},
  const  = {\ text}
}