Skudutyte-Rysstad, Rasa, Harald M. Eriksen, and Espen Bjertness. “Oral Health Among 35-Year-Olds in Oslo, Norway. A Summary of Time Trends 1973-2003”. Norsk Epidemiologi 22, no. 1 (May 7, 2012). Accessed April 30, 2024. https://www.ntnu.no/ojs/index.php/norepid/article/view/1518.