Hogstad, Olav. “Are Wintering Common Redpolls Carduelis Flammea More Exposed to Avian Predators Than Other Small Passerines?”. Ornis Norvegica 40 (November 9, 2017): 45-48. Accessed August 12, 2020. https://boap.uib.no/index.php/ornis/article/view/1359.