Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Azriel Rosenfeld, Connectivity in Digital Pictures, Journal of the ACM (JACM), v.17 n.1, p.146-160, Jan. 1970  [doi>10.1145/321556.321570]
	2	John P. Mylopoulos, On the definition and recognition of patterns in discrete spaces, 1970
	3	Perceptrons: An Introduction to Computational Geometry, The MIT Press, 1969
	4	J. P. Mylopoulos , T. Pavlidis, On the Topological Properties of Quantized Spaces, I. The Notion of Dimension, Journal of the ACM (JACM), v.18 n.2, p.239-246, April 1971  [doi>10.1145/321637.321644]

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