Water management and environmental problems of the Ob basin: current state and forecast until  by Alexandr V. Puzanov, Dmitry M. Bezmaternykh, Nadezhda I. Yermolaeva, Alexandr T. Zinovyev, Evgeniya D. Kosheleva, Bella A. Krasnoyarova, Olga V. Lovtskaya, Tatyana S. Papina, Irina D. Rybkina, Dmitry N. Troshkin, Sofia N. Sharabarina, Lyubov V. Yanygina