1. Bergdahl E, Allard P, Lundman B, Gustafson Y. (2007). Depression in the oldest old in urban and rural municipalities. Aging and Mental Health 11(5):570-578.
2. Bergdahl E, Allard P, Lundman B, et al. (2007). Gender differences in depression among the very old. International Psychogeriatrics 19(6):1125-40.