Campbell J.C, Ikegami N..  2000.  Long-term care insurance comes to Japan. Health Aff (Millwood). 19(3):26-39.

Carpenter G.I, Hirdes J.P, Ribbe M.W, Ikegami N., Challis D., Steel K., Bernabei R., Fries B..  1999.  Targeting and quality of nursing home care. A five-nation study. Aging-Clinical & Experimental Research. 11(2):83-9.

Carpenter G.I, Ikegami N., Ljunggren G., Carrillo E., Fries B.E.  1997.  RUG-III and resource allocation: comparing the relationship of direct care time with patient characteristics in five countries. Age & Ageing. 26(Suppl 2):61-5.

Feng Z.L, Hirdes J.P, Smith T.F, Finne-Soveri H., Chi I., Pasquier J.NDu, Gilgen R., Ikegami N., Mor V..  2009.  Use of physical restraints and antipsychotic medications in nursing homes: a cross-national study. International Journal of Geriatric Psychiatry. 24(10):1110-1118.

Fries B.E, Ikegami N..  1994.  Heading in the right direction. Gerontologist. 34(5):582-3.

Hirdes J., Fries B.E., Morris J.N., Ikegami N., Zimmerman D., Dalby D.M, Aliaga P., Hammer S., Jones R..  2001.  interRAI Home Care Quality Indicators (HCQIs) for MDS-HC Version 2.0.. 

Hirdes J.P, Fries B.E, Morris J.N, Ikegami N., Zimmerman D., Dalby D.M, Aliaga P., Hammer S., Jones R..  2004.  Home care quality indicators (HCQIs) based on the MDS-HC. Gerontologist. 44(5):665-679.

Hirdes J.P, Ikegami N., Jonsson P.V, Topinkova E., Maxwell C.J, Yamauchi K..  2000.  Cross-national comparisons of antidepressant use among institutionalized older persons based on the minimum data set (MDS). Canadian Journal on Aging-Revue Canadienne Du Vieillissement. 19:18-37.

Hirdes J.P, Smith T.F, Rabinowitz T., Yamauchi K., Pérez E., Telegdi N.C, Prendergast P., Morris J.N, Ikegami N., Phillips C.D et al..  2003.  The resident assessment instrument-mental health (RAI-MH): Inter-rater reliability and convergent validity. Journal of Behavioral Health Services & Research. 29(4):419-432.

Hughes C.M, Lapane K.L, Mor V., Ikegami N., Jonsson P.V, Ljunggren G., Sgadari A..  2000.  The impact of legislation on psychotropic drug use in nursing homes: a cross-national perspective. Journal of the American Geriatrics Society. 48(8):931-7.

Ikegami N..  1997.  Development of the MDS-HC and outcome research in home care. Kango kenkyu. The Japanese journal of nursing research. 30(5):365-376.

Ikegami N., Fries B.E, Takagi Y., Ikeda S., Ibe T..  1994.  Applying RUG-III in Japanese long-term care facilities. Gerontologist. 34(5):628-39.

Ikegami N., Igarashi C, Takagi Y., Kato T, Mor V..  1997.  The impact of the Minimum Data Set and Resident Assessment Instrument on the quality of care plans in Japan.. Canadian Journal of Quality in Health Care. 14(3):23-28.

Ikegami N., Yamada Y.  1999.  MDS-HC 2.0 - Its revision and impact [Japanese]. Japanese Journal of Home Care Nursing. 4(4):293-308.

Morris J.N, Fries B.E, Keel K., Ikegami N., Bernabei R., Carpenter G.I, Gilgen R., Hirdes J.P, Topinkova E..  1997.  Compresensive clinical assessment in community setting: applicability of the MDS-HC. J Am Geriatr Soc. 45(8):1017-1024.

Ribbe M.W, Ljunggren G., Steel K., Topinkova E., Hawes C., Ikegami N., Henrard J.C, Jonnson P.V.  1997.  Nursing homes in 10 nations: A comparison between countries and settings. Age & Ageing. 26(SUPPL. 2):3-12.

Tsuchiya-Ito R., Naruse T., Ishibashi T., Ikegami N..  2022.  The revised index for social engagement (RISE) in long-term care facilities: reliability and validity in Japan. Psychogeriatrics. 22(1):122-131.

Yamauchi K., Ikegami N..  1999.  Cognitive performance scale (CPS). Journal of Geriatric Psychiatry. 10(8):943-952.