YASCHENKO, L. O. Methodological Background for Spectral Analysis, Illustrated by Studying the Number of Ukrainian Population. Statistics of Ukraine, [S. l.], n. 1(68), p. 4–10, 2015. Disponível em: https://su-journal.com.ua/index.php/journal/article/view/3. Acesso em: 16 jul. 2026.