1. Aubin, J.P.; Ekeland, I. (1984): Applied Nonlinear Analysis. John Wiley, New York.
2. Benker, H.; Hamel, A.; Tammer, Chr. (1996): A Proximal Point Algorithm for Control Approximation Problems. ZOR — Mathematical Methods of Operations Research 43 (3), 261–280.
3. Lecture Notes in Economics and Mathematical Systems;H Benker,1997
4. Deutsche Hochschulschrif-ten;H Benker,1997
5. Carrizosa, E.; Fernandez, R. (1993), A polygonal upper bound for the efficient set for single-location problems with mixed norms, Top (Spanish Journal of Operations Research and Statics), 1, 107–116.