1. Bector, C. R.: Indefinite Quadratic Programming with Standard Errors in Objective, Research Report, Mathematics Department, Indian Institute of Technology, Kanpur (India), 1966.
2. ——: Indefinite Cubic Programming with Standard Errors in Objective Function, Unternehmensforschung,12, 1968, 113–120.
3. Charnes, A. andW. W. Cooper: Programming with Linear Fractional Functionals, Naval Research Logistics Quarterly,9, 1962, 181–186.
4. Dickson, L. E.: Modern Elementary Theory of Numbers, University of Chicago Press, Chicago, 1939.
5. Dinkelbach, W.: Die Maximierung eines Quotienten zweier linearer Funktionen unter linearen Nebenbedingungen, Zeitschrift für Wahrscheinlichkeitstheorie,1, 1962, 141–145.