Achterberg, WP, Scherder, E., Pot, A. M., Ribbe, M. W. 2007. Cardiovascular risk factors in cognitively impaired nursing home patients: a relationship with pain?. European Journal of Pain: Ejp. 11 (6) 707-10.
Proctor, W. R., Hirdes, J. P. 2001. Pain and cognitive status among nursing home residents in Canada. Pain Research & Management. 6 (3) 119-25.
Finne-Soveri, H., Tilvis, R. S. 1998. Daily pain, its associates and impact on work load in institutional long-term care. Archives of Gerontology & Geriatrics. 27 (2) 105-114.