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REFERENCES.

KRAKAUER, L.J.	1971.
	Computer Analysis of Visual Properties of Curved Objects.
	Project MAC, Technical Report TR-82.
	Massachusetts Institute of Technology.
	Cambridge, Massachusetts 02139.

ZAHN, C.T.	1966.
	Two Dimensional Pattern Description and Recognition
	  via curvature points.
	SLAC Report 70.
	Stanford Linear Acceleration Center.
	Stanford University.
	Stanford, Cailfornia.

KNUTH, D.E.	1968.
	The Art of Computer Programming.
	Volume 1, Fundamental Algorithms.
	Chapter 2, Information Structures.
	Addison-Wesley.
	Reading, Massachusetts.