GUDZ, Piotr, Kujawsko-Pomorska Szkoła Wyższa w Bydgoszczy, Polska Gulina, Olena, Kyiv National University of Technologies and Design Gulina, Olena, Kyiv National University of Technologies and Design, Ukraine. GUMA, Griselda Muhametaj, Університет Тирани, Албанія
