Inclusion as an environmental imperative of educational activity in university, secondary and preschool educationGalina Stepanova, Anastasia Demchuk, Anna Tashcheva, Svetlana Gridneva, Julia Yakovleva, Yaroslav Zaichikov and Mariam ArpentievaE3S Web Conf., 284 (2021) 09001DOI: https://doi.org/10.1051/e3sconf/202128409001