@Article{Larsen:2010:Scientometrics:20700371,
  author = {Larsen, P O and von Ins, M},
  title  = {The rate of growth in scientific publication and the decline in coverage provided by Science Citation Index},
  journal = {Scientometrics},
  year   = {2010},
  number = {3},
  url    = {http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2909426/},
  doi = {10.1007/s11192-010-0202-z},
  const  = {\ text}
}
@Article{small1973cocitation,
  author = {Small, Henry},
  title  = {Co-citation in the scientific literature: A new measure of the relationship between two documents},
  journal = {Journal of the American Society for Information Science},
  year   = {1973},
  number = {4},
  url    = {http://dx.doi.org/10.1002/asi.4630240406},
  doi = {10.1002/asi.4630240406},
  const  = {\ text}
}