Bikelis, Algimantas, and Audrius Galinskis. “Bergstremo Asimptotiniai Skleidiniai”. Lietuvos matematikos rinkinys 48, no. proc. LMS (December 28, 2008): 381–385. Accessed August 21, 2025. https://www.zurnalai.vu.lt/LMR/article/view/18126.