C. Weng, P. Payne, M. Velez, S. Johnson, and S. Bakken. Nursing Informatics, volume 201 of Studies in Health Technology and Informatics, page 461-469. IOS Press, (2014)
R. Bakken. Norwegian University of Science and Technology, Trondheim, Norway, (2014)base-search.net (ftntnutrondircom:oai:brage.bibsys.no:11250/253611).