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2. Syntactic Structures;Chomsky,1957
3. Syntactic description of pictures and gestalt phenomena of visual perception;Narasimhan,1963
4. Experiments in processing pictorial information with a digital computer;Kirsch,1957
5. P.H. Swain, K.S. Fu, Nonparametric and linguistic approach to pattern recognition LARS Report, Purdue University, TREE-70-20