@book{kaufman1990finding,
  author = {Kaufman, L. and Rousseeuw, P. J.},
  interhash = {119bf8c432712ad3bbc1612759e0b7b4},
  intrahash = {6f403cbc240f28b3aa461b19aee77238},
  isbn = {1-58133-109-7},
  publisher = {John Wiley},
  title = {Finding Groups in Data: An Introduction to Cluster Analysis},
  year = 1990
}