Ivanauskas, Feliksas, Remigijus Lapinskas, and Mečislovas Žalakevičius. “Climate Change and Fenology of Birds Sprig Arrival”. Lietuvos matematikos rinkinys 48, no. proc. LMS (December 21, 2008): 205–209. Accessed November 7, 2025. https://www.zurnalai.vu.lt/LMR/article/view/18095.