1. Ben-Tal, A., andA. Ben-Israel:F-convex Functions: Properties and Applications. Generalised Concavity in Optimization and Economics. Ed. by S. Schaible and W.C. Ziemba. New York 1981, 301–334.
2. Blair, C.E., andR.G. Jeroslow: The Value Function of an Integer Program. Mathematical Programming23, 1982, 237–273.
3. Burkard, R.E., andU. Zimmermann: Combinatorial Optimization in Linearly Ordered Semimodules: A Survey. Modern Applied Mathematics: Optimization and Operations Research. Ed. by B. Korte. Amsterdam 1982, 391–436.
4. Dolecki, S., andS. Kurcyusz: On Φ-Convexity in Extremal Problems. SIAM Journal on Control and Optimization16, 1978, 277–300.
5. Elster, K.H., andR. Nehse: Zur Theorie der Polarfunktionale. Mathematische Operationsforschung und Statistik5, 1974, 3–21.