Sirkiä, S., Helle, P., Lindén, H., Nikula, A., Norrdahl, K., Suorsa, P. ja Valkeajärvi, P. 2011. Persistence of Capercaillie (Tetrao urogallus) lekking areas depends on forest cover and fine-grain fragmentation of boreal forest landscapes. Ornis Fennica. 88, 1 (maalis 2011), 14–29. DOI:https://doi.org/10.51812/of.133759.