LenyukM. P., and OleinikN. P. 1993. “On a Class of Hybrid Integral Transformations (Bessel-Fourier-Bessel-. -Fourier-Bessel) on the Polar Axis With $2n$ Junction Points”. Ukrains’kyi Matematychnyi Zhurnal 45 (8), 1096–1103. https://umj.imath.kiev.ua/index.php/umj/article/view/5905.