@misc{doerffer_factor_analysis_1989, 
author={Doerffer, R., Murphy, D.},
title={Factor analysis and classification of remotely sensed data for monitoring tidal flats},
year={1989},
howpublished = {GKSS report},
note = {Doerffer, R.; Murphy, D.: Factor analysis and classification of remotely sensed data for monitoring tidal flats. Helgolaender Meeresuntersuchungen. 1989. vol. 43, 275-293.}}