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Uusitalo, M.A., Ilmoniemi, R.J. Signal-space projection method for separating MEG or EEG into components. Med. Biol. Eng. Comput. 35, 135–140 (1997). https://doi.org/10.1007/BF02534144
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DOI: https://doi.org/10.1007/BF02534144