Original version in English.
The Polish translation may be found at: https://doi.org/10.17185/duepublico/73568
10.17185/duepublico/70449 copy citation link
URN (urn:nbn:de:hbz:464-20190820-140644-7)
https://nbn-resolving.org/urn:nbn:de:hbz:464-20190820-140644-7
DOI (10.17185/duepublico/70449)
https://doi.org/10.17185/duepublico/70449