Norevik, Gabriel. “Horned Grebe Podiceps Auritus and Red-Necked Grebe Podiceps Grisegena in Sweden 2011—results from a National Survey”. Ornis Svecica 24, no. 3–4 (October 1, 2014): 81–98. Accessed April 26, 2024. https://journals.lub.lu.se/os/article/view/22557.