@article{Baragona1997,
	title = {An Optimality Criterion for Aggregating a Set of Time Series in a
	Composite Index},
	author = {R. Baragona and F. Carlucci},
	day = {01},
	journal = {Journal of Time Series Analysis},
	month = {Jan},
	note = {doi: 10.1111/1467-9892.00035},
	number = {1},
	pages = {1--9},
	url = {http://www.blackwell-synergy.com/doi/abs/10.1111/1467-9892.00035},
	volume = {18},
	year = {1997},
	biburl = {http://www.bibsonomy.org/bibtex/2d2a751a357f17a7902b087f87ccaa7e0/smicha},
	keywords = {imported }
}