V-Codes: Relational problems. ValueOptions 2006.
V-Codes: Relational problems [link]Paper  bibtex   
@misc{ValueOptions2006V-Codes:,
  author = {ValueOptions},
  title = {V-Codes: Relational problems},
  address = {USA},
  year = {2006},
  keywords = {Classification},
  url = {www.valueoptions.com/providers/Handbook.htm},
  language = {English}
}

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