Britt Slagsvold, Marijke Veenstra, Svein Olav Daatland, Gunhild Hagestad, Thomas Hansen, Katharina Herlofson, Kristine Koløen, Per Erik Solem. Life-course, ageing and generations in Norway: the NorLAG study. Norsk Epidemiologi, volume 22, issue 2, pages 95-102, 2012.