Siermontowski, Piotr, et al. “Assessment on the Impact of Hyperbaric Environment – Nitrogen Narcosis on Brain Functions and Perception During Air Saturation by Use of Arithmetic Test”. Current Problems of Psychiatry, vol. 12, no. 2, June 2011, pp. 137-40, https://czasopisma.umlub.pl/cpp/article/view/2376.