Challenges and Progress in improving Safety and Managing Radioactive Wastes at Chornobyl NPP and in the Chornobyl Exclusion Zone - N. Molitor; Z. Drace; D. Bugai; A. Sizov; K. Haneke; S. Thierfeldt; O. Nitzsche; Y. Shapiro (Problems of nuclear power plants safety and of Chornobyl, 2017)