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© 2018 Jean-Marc Luukinen, Daniel Aalto, Jarmo Malinen, Naoko Niikuni, Jani Saunavaara, Päivi Jääsaari, Antti Ojalammi, Riitta Parkkola, Tero Soukka, Risto-Pekka Happonen, published by Slovak Academy of Sciences, Institute of Measurement Science
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