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[1] GOLDSTEIN, H. 1950.
	Classical Mechanics.
	Addison-Wesley.
	Reading, Massachusetts.

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

[3] 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.

[4] ZAHN, C.T.	1966.
	Two Dimensional Pattern Description and Recognition
	  via curvature points.
	SLAC Report 70.
	Stanford Linear Acceleration Center.
	Stanford University.
	Stanford, Cailfornia.
~I1973,800;F8- 52 -