@BOOK{Jolliffe:2002,
AUTHOR={I T Jolliffe},
TITLE={Principal Component Analysis},
PUBLISHER={Springer},
YEAR={2002},
URL={http://www.springer.com/statistics/statistical+theory+and+methods/book/978-0-387-95442-4}
}

@BOOK{Gorban:2008,
AUTHOR={A N Gorban and B K\'egl and D C Wunsch and A Zinovyev},
TITLE={Principal Manifolds for Data Visualization and Dimension Reduction},
PUBLISHER={Springer},
YEAR={2008},
URL={http://www.springer.com/math/cse/book/978-3-540-73749-0}
} 

@Comment @INPROCEEDINGS{Al-Kandari:1999,
@Comment AUTHOR={N Al-Kandari},
@Comment TITLE={Variable Selection and Principal Component Analysis},
@Comment BOOKTITLE={Bulletin of the International Statistical Institute (52nd Session)},
@Comment YEAR={1999},
@Comment NOTE={available online at http://www.stat.fi/isi99/proceedings.html}
@Comment }

@ARTICLE{Jolliffe:1972,
AUTHOR={I T Jolliffe},
TITLE={Discarding Variables in a Principal Component Analysis I: Artificial 
Data},
JOURNAL={Applied Statistics},
YEAR={1972},
VOLUME={21},
PAGES={160-173}
}

@ARTICLE{Jolliffe:1972,
AUTHOR={I T Jolliffe},
TITLE={Discarding Variables in a Principal Component Analysis II: Real 
Data},
JOURNAL={Applied Statistics},
YEAR={1972},
VOLUME={21},
PAGES={160-173}
}

@ARTICLE{Cadima:1995,
AUTHOR={J F C L Cadima and I T Jolliffe},
TITLE={Loadings and Correlations in the interpretation 
of Principal Components},
JOURNAL={Journal of Applied Statistics},
YEAR={1995},
VOLUME={22},
NUMBER={2},
PAGES={203-214}
}

@ARTICLE{McCabe:1984,
AUTHOR={G P McCabe},
TITLE={Principal Variables},
JOURNAL={Technometrics},
YEAR={1984},
VOLUME={26},
NUMBER={2},
PAGES={137-144}
}

@ARTICLE{Zou:2006,
AUTHOR={H Zou and T Hastie and R Tibshirani},
TITLE={Sparse Principal Component Analysis},
JOURNAL={Journal of Computational and Graphics System},
YEAR={2006},
VOLUME={15},
NUMBER={2},
PAGES={262-286},
NOTE={available on Hastie's homepage, http://www-stat.stanford.edu/~hastie/Papers/; See also the R {\tt elasticnet} package}
}