Švitra, Donatas, and Ingrida Sirvydaitė. “ About the Location of Some Quasipolinomial Roots”. Lietuvos matematikos rinkinys 44, no. spec. (December 17, 2004): 174–179. Accessed January 16, 2026. https://www.zurnalai.vu.lt/LMR/article/view/31909.