Parasyuk ОS. Analytical continuation of expansions in Hegenbauer polynomials and its application to the investigation of the properties of the scattering amplitude. Ukr. Mat. Zhurn. [Internet]. 1966 Jun. 28 [cited 2025 Apr. 13];18(4):126-8. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8323