Geoecological investigations of artificial radionuclides in the aquatic system of the Ob River and Kara SeaO. Stepanets, A. Borisov, A. Ligaev, A. Travkina and J. BrownRadioprotection, 44 5 (2009) 311-314DOI: https://doi.org/10.1051/radiopro/20095060