To cite superpc in publications use:

Bair E, Tibshirani R (2004). “Semi-supervised methods to predict patient survival from gene expression data.” PLoS Biol, 2(4), e108.

Bair E, Hastie T, Paul D, Tibshirani R (2006). “Prediction by supervised principal components.” J. Am. Stat. Assoc., 101(473), 119-137.

Corresponding BibTeX entries:

  @Article{,
    title = {Semi-supervised methods to predict patient survival from
      gene expression data},
    author = {E. Bair and R. Tibshirani},
    journal = {PLoS Biol},
    year = {2004},
    volume = {2},
    number = {4},
    pages = {e108},
  }

  @Article{,
    title = {Prediction by supervised principal components},
    author = {E. Bair and T. Hastie and D. Paul and R. Tibshirani},
    journal = {J. Am. Stat. Assoc.},
    year = {2006},
    volume = {101},
    number = {473},
    pages = {119-137},
  }