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3. K.J. Arrow and R.M. Solow, in:Studies in linear and non-linear programming, Eds. K.J. Arrow, L. Hurwicz and H. Uzawa (Stanford University Press, Stanford, Calif., 1958).
4. E. Bodewig,Matrix calculus (North-Holland, Amsterdam, 1956) 66, 69.
5. A.R. Colville, “A comparative study on nonlinear programming codes”, IBM New York Scientific Center Report No. 320-2949 (1968). See also new reported results inInteger and nonlinear programming, Ed. J. Abadie (North-Holland, Amsterdam, 1970).