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Haenggi, Matthias; Ypparila-Wolters, Heidi; Buerki, Sarah; Schlauri, Rebekka; Korhonen, Ilkka; Takala, Jukka; Jakob, Stephan M (2009). Auditory event-related potentials, bispectral index, and entropy for the discrimination of different levels of sedation in intensive care unit patients. Anesthesia and analgesia, 109(3), pp. 807-16. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1213/ane.0b013e3181acc85d

Haenggi, Matthias; Ypparila-Wolters, Heidi; Hauser, Kathrin; Caviezel, Claudio; Takala, Jukka; Korhonen, Ilkka; Jakob, Stephan M (2009). Intra- and inter-individual variation of BIS-index and Entropy during controlled sedation with midazolam/remifentanil and dexmedetomidine/remifentanil in healthy volunteers: an interventional study. Critical care, 13(1), R20. London: BioMed Central 10.1186/cc7723

Hänggi, Matthias; Ypparila-Wolters, Heidi; Bieri, Christine; Steiner, Carola; Takala, Jukka; Korhonen, Ilkka; Jakob, Stephan M (2008). Entropy and bispectral index for assessment of sedation, analgesia and the effects of unpleasant stimuli in critically ill patients: an observational study. Critical care, 12(5), R119. London: BioMed Central 10.1186/cc7015