Y. Sun, R. Barber, M. Gupta, C. Aggarwal, and J. Han. Proceedings of the 2011 International Conference on Advances in Social Networks Analysis and Mining, page 121--128. Washington, DC, USA, IEEE Computer Society, (2011)
S. Lee, and P. Abbott. Journal of Biomedical Informatics, 36 (4-5):
389 - 399(2003)Building Nursing Knowledge through Informatics: From Concept Representation
to Data Mining.