MALLON , Lena; HETTA , Jerker. A Survey of Sleep Habits and Sleeping Difficulties in an Elderly Swedish Population. Upsala Journal of Medical Sciences, [S. l.], v. 102, n. 3, p. 185–198, 1997. DOI: 10.3109/03009739709178940. Disponível em: https://ujms.net/index.php/ujms/article/view/6625. Acesso em: 14 nov. 2026.