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Copyright (c) 2020 Heikki Paunonen, Hannu Remes

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

ISSN 1736-9290 (print)
ISSN 2228-3854 (online)
DOI  https://doi.org/10.5128/LV.1736-9290