Armstrong J.J, Zhu M., Hirdes J.P, Stolee P..  2012.  K-means cluster analysis of rehabilitation service users in the Home Health Care System of Ontario: examining the heterogeneity of a complex geriatric population. Arch Phys Med Rehabil. 93(12):2198-205.

Lakhan P., Jones M., Wilson A., Gray L.C.  2013.  The Higher Care At Discharge Index (HCDI): identifying older patients at risk of requiring a higher level of care at discharge. Arch Gerontol Geriatr. 57(2):184-91.