Jaatinen K, Lehikoinen A, Lank DB. Female-biased sex ratios and the proportion of cryptic male morphs of migrant juvenile Ruffs (Philomachus pugnax) in Finland . Ornis Fenn [Internet]. 31 december 2010 [citerad 18 maj 2024];87(4):125–134. Tillgänglig vid: https://ornisfennica.journal.fi/article/view/133751