Neurophysiological and neuropsychological methods for estimation of the CNS vigilance levels, related to occupational stressTuulik, Viiu; Raja, Aimur; Lossmann, Eerik; Meister, AntsICCEF '98 : 8th International Conference on Combined Effects of Environmental Factors, Baden, Wien, September 19-23, 1998 : abstracts1998 / p. 53