1. Bector, C.R.: Duality in Linear Fractional Programming, Utilitas Mathematica, Winnipeg,4, 1973, 155–168.
2. —: Duality in Nonlinear Fractional Programming, Zeitschrift für Operations Research17, 1973, 183–193.
3. Chadha, S.S.: A Dual Fractional Program, ZAMM51, 1971, 560–561.
4. Craven, B.D., andB. Mond: The Dual of a Fractional Linear Program, Journal of Math. Anal. and Appl.42, 1973, 507–512.
5. Jagannathan, R.: Duality for Nonlinear Fractional Programs. Zeitschrift für Operations Research17, 1973, 1–3.