The ecological approach to the city-planning in modern megalopolises Dmitry Radushinsky, Thi Nhan Nguyen, Van Loc Nguyen, Marina Gubankova, Doan Thi Mai Huong and Alina Fatkullina E3S Web Conf., 91 (2019) 05026 Published online: 02 April 2019 DOI: 10.1051/e3sconf/20199105026