The use of principal component analysis for interpreting ground water hydrographs. Winter, T. C., Mallory, S. E., Allen, T. R., & Rosenberry, D. O. Ground Water, 2000.
bibtex   
@article{winter_use_2000,
	title = {The use of principal component analysis for interpreting ground water hydrographs},
	volume = {38},
	number = {2},
	journal = {Ground Water},
	author = {Winter, T. C. and Mallory, S. E. and Allen, T. R. and Rosenberry, D. O.},
	year = {2000},
	keywords = {HBR}
}

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