@ARTICLE{KunchevaTNNLS14,
title = {{PCA} feature extraction for change 
detection in multidimensional unlabelled data},
author = {L. I. Kuncheva and W. J. Faithfull},
journal = {{IEEE} Transactions on Neural Networks 
and Learning Systems},
volume = {25},
number = {1},
year = {2014},
pages = {69--80},
doi = {10.1109/TNNLS.2013.2248094}
}