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BIBLIOGRAPHY 
Helbig, H., W. Tzschupke 
1972: A New Method for Evaluating and Mapping Colors 
in Aerial Photographs, 
Proc. 8. Int. Symp. "Remote Sensing of the 
Environment", Ann Arbor 1972, Vol. II 
Helbig, H. 
1973: Fast Automated Analysis and Classification of 
Color Pictures by Signature and Pattern Recog 
nition Using a Color Scanner, 
Proc. Conf. "Machine Processing of Remotely 
Sensed Data", 
Purdue University, Lafayette 1973