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Proceedings of ECOpole > 2018 > Vol. 12, No. 1 > 107--115
Proceedings of ECOpole > 2017 > Vol. 11, No. 1 > 123--129
Proceedings of ECOpole > 2015 > Vol. 9, No. 1 > 155--162
Proceedings of ECOpole > 2015 > Vol. 9, No. 1 > 163--170
Proceedings of ECOpole > 2015 > Vol. 9, No. 2 > 533--540