• Higuchi fractal dimension and spectral entropy as measures of depth of sedation in intensive care unitAnier, Andres; Lipping, Tarmo; Melto, S.; Hovilehto, S.Proceedings of the 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society : San Francisco, CA, USA, September 1-5, 2004. Vol. 12004 / p. 526-529 : ill https://pubmed.ncbi.nlm.nih.gov/17271729/