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3. Bever, T.G., Lackner, J.R., and Kirk, R. The underlying structures of sentences are the primary units of immediate speech processing. Perception and Psychophysics, 5, 225-234, 1969. Reprinted in G.H. Harman (Ed.), On Noam Chomsky. Doubleday Anchor, 1974.
4. Bever, T.G., Kirk, R. and Lackner, J.R. An autonomic reflection of syntactic structure. Neuropsychologia, 7, 23-28, 1969.