Jaatinen, K., A. Lehikoinen, and D. B. Lank. “Female-Biased Sex Ratios and the Proportion of Cryptic Male Morphs of Migrant Juvenile Ruffs (Philomachus Pugnax) in Finland”. Ornis Fennica 87, no. 4 (December 31, 2010): 125–134. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133751.