SukhorolskyiM. A. 2010. “Expansion of Functions in a System of Polynomials Biorthogonal on a Closed Contour With a System of Functions Regular at Infinitely Remote Point”. Ukrains’kyi Matematychnyi Zhurnal 62 (2), 238–254. https://umj.imath.kiev.ua/index.php/umj/article/view/2860.