Trabajos publicados por el Dr. Hab. Andrzej Krzanowski
Prepared by Andrzej Krzanowski, with revised by Krzysztof Tunia
Copyright by PTSL © 2021. With all rights reserved unless otherwise noted. The Journal supports Open Access principles and practices in which research outputs are distributed online, free of cost or other access barriers. Creative Commons open access licenses are applied wherever possible. Creative Commons licensing is mandatory for future submissions.