1. Helverschou SB, Bakken TL, Martinsen H. (2008). Identifying symptoms of psychiatric disorders in people with autism and intellectual disability: an empirical conceptual analysis. Mental Health Aspects of Developmental Disabilities 11:105-15 (36 ref).
2. Bakken TL, Friis S, Lovoll S, Smeby NA, et al. (2007). Behavioral disorganization as an indicator of psychosis in adults with intellectual disability and autism. Mental Health Aspects of Developmental Disabilities 10:37-46 (41 ref).