OsilenkerB. P. (1994) “M. G. Krein’s ideas in the theory of orthogonal polynomials”, Ukrains’kyi Matematychnyi Zhurnal, 46(1-2), pp. 76–86. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5771 (Accessed: 27July2024).