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P. Lampart
https://www.imp.gda.pl/files/transactions/141/paper3_141_2018_.pdf/No. 141, 2018, 41-52
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R. Matysko
https://www.imp.gda.pl/fileadmin/files/transactions/141/paper2_141_2018_.pdf/No. 141, 2018, 31-40
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P. Kowalski
https://www.imp.gda.pl/fileadmin/files/transactions/141/paper1_141_2018_.pdf/No. 141, 2018, 3-30