Hogstad, Olav. “Species Richness and Structure of a Breeding Passerine Bird Community in a Spruce-Dominated Boreal Forest in Central Norway: Stability from 1960s to 2013”. Ornis Norvegica 36 (October 29, 2013): 52-60. Accessed August 12, 2020. https://boap.uib.no/index.php/ornis/article/view/494.