1. Bui-Trong-Lieu, Huard, P.: La methode des centres dans un espace topologique. Numerische Math.8, (1) (1966).
2. Fiacco, A. V., McCormick, G. P.: The sequential unconstrained minimization technique for nonlinear programming. Management Science10, (2) (1964).
3. - - The slacked unconstrained minimization technique for convex programming. Congress ES/TIMS. Warsaw 1966.
4. Frisch, R. A. K.: Principals of linear programming with particular reference to double gradient form of the logarithmic potential method. Memorandum of the University of Economics, Oslo 1954.
5. - The logarithmic potential method of convex programming. Memorandum of the University Institute of Economics, Oslo 1955