S. Tsuru, Y. Iizuka, and M. Munechika. Nursing Informatics, volume 146 of Studies in Health Technology and Informatics, page 391-395. IOS Press, (2009)
H. Iizuka, and T. Ikegami. Artificial Life XI: Proceedings of the Eleventh
International Conference on the Simulation and
Synthesis of Living Systems, page 776. MIT Press, Cambridge, MA, (2008)