Chen, G. Y.; Huang, X. X. - In: Mathematical Methods of Operations Research 48 (1998) 3, pp. 349-357
This paper att empts to give a unified approach to the existing three types of variational principles for vector valued functions: A. B. Nemeth (1986), Chr. Tammer (1992) and G. Isac (1996). Some of the results we obtain are variants of the authors' mentioned above. Some are even stronger than...
