2Scholes M, Barber B. Towards nursing informatics[J]. Medinfo, 1980: 70-73.
3Staggers N, Thompson CB. The evolution of definitions for nursing informatics[J]. J Am Med Inform Assoc, 2002, 9(3): 255-261.
4American Nurses Association. Report on the designation of nursing informatics as a nursing specialty[C]. Congress of Nursing Practice unpublished report, Washington DC. 1992.
5Hartigan JA. Direct clustering of a data matrix[J]. Journal of the American Statistical Association, 1972, 67(337): 123-129.