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3. M. P. Barnett and W. M. Ruhsam, “A Natural Language Programming System for Text Processing,”IEEE Transactions on Engineering, Writing and Speech, Vol. EWS-11. (1968), p. 45.
4. M. P. Barnett and R. P. Futrelle, “Syntactic Analysis by Digital Computer,”Comm. A. C. M., 5 (1962), 515.
5. M.P. Barnett,Computer Typesetting—Experiments and Prospects, Cambridge, M.I.T. Press, 1965.