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3. Goldstein, A. A.: On the method of descent in convex domains and its application to the minimal approximation of overdetermined systems of linear equations. Convair astronautics, math. pre-print No. 1 (1956).
4. Zuhovickii, S. I.: An algorithm for the solution of the Chebychev approximation problem in the case of a finite system of incompatible linear equations. Doklady Akad. Nauk SSR (N.S.) 79 (1951) [Russian].
5. Cheney, W., andA. A. Goldstein: Note on a paper by Zuhovickii concerning the Tchebycheff problem for linear equations. J. soc. Indust. appl. Math.6, No. 3 (Sept. 1958).