@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 = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Doerffer, R.; Murphy, D.: Factor analysis and classification of remotely sensed data for monitoring tidal flats. Helgolaender Meeresuntersuchungen. 1989. vol. 43, 275-293.}}