Sokolov, L. V., and A. P. Shapoval. “Long-Term Dynamics of Age Ratios in Short- and Long Distance Migrants During Autumn Migration on the Courish Spit of the Baltic Sea”. Acta Biologica Sibirica 4, no. 4 (December 22, 2018): 71-80. Accessed July 4, 2022. http://journal.asu.ru/biol/article/view/4878.