@article{Hnatyuk_2011, title={Relative Chebyshev point of a system of continuously varying bounded closed sets}, volume={63}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/2773}, abstractNote={For the problem of finding a relative Chebyshev point of a system of continuously varying (in the sense of the Hausdorff metric) bounded closed sets of a normed space linear over the field of complex numbers, we establish some existence and uniqueness theorems, necessary and sufficient conditions, and criteria for a relative Chebyshev point and describe properties of the extremal functional and the extremal operator.}, number={7}, journal={Ukrainsâ€™kyi Matematychnyi Zhurnal}, author={Hnatyuk, Yu. V.}, year={2011}, month={Jul.}, pages={889-903} }