@article{small1973cocitation,
  abstract = {A new form of document coupling called co-citation is defined as the frequency with which two documents are cited together. The co-citation frequency of two scientific papers can be determined by comparing lists of citing documents in the Science Citation Index and counting identical entries. Networks of co-cited papers can be generated for specific scientific specialties, and an example is drawn from the literature of particle physics. Co-citation patterns are found to differ significantly from bibliographic coupling patterns, but to agree generally with patterns of direct citation. Clusters of co-cited papers provide a new way to study the specialty structure of science. They may provide a new approach to indexing and to the creation of SDI profiles.},
  author = {Small, Henry},
  doi = {10.1002/asi.4630240406},
  interhash = {dfbb7636c96853cc258878548c12d12f},
  intrahash = {1dc18dfe50667ff19d5cfa9d52d3e37b},
  issn = {1097-4571},
  journal = {Journal of the American Society for Information Science},
  number = 4,
  pages = {265--269},
  publisher = {Wiley Subscription Services, Inc., A Wiley Company},
  title = {Co-citation in the scientific literature: A new measure of the relationship between two documents},
  url = {http://dx.doi.org/10.1002/asi.4630240406},
  volume = 24,
  year = 1973
}

@article{an2004characterizing,
  acmid = {1031388},
  address = {New York, NY, USA},
  author = {An, Yuan and Janssen, Jeannette and Milios, Evangelos E.},
  doi = {http://dx.doi.org/10.1007/s10115-003-0128-3},
  interhash = {73fdd0592c1641d05da5d2323d9f59ae},
  intrahash = {60e0c625f5765a05c588c6765a8cd93c},
  issn = {0219-1377},
  issue = {6},
  journal = {Knowl. Inf. Syst.},
  month = {November},
  numpages = {15},
  pages = {664--678},
  publisher = {Springer-Verlag New York, Inc.},
  title = {Characterizing and Mining the Citation Graph of the Computer Science Literature},
  url = {http://dx.doi.org/10.1007/s10115-003-0128-3},
  volume = 6,
  year = 2004
}