Hnatyuk, Yu. V. 2003. “Algorithms for the Best Simultaneous Uniform Approximation of a Family of Functions Continuous on a Compact Set by a Chebyshev Subspace”. Ukrains’kyi Matematychnyi Zhurnal 55 (3), 291-306. https://umj.imath.kiev.ua/index.php/umj/article/view/3908.