Application of the phase method in radioisotope measurements of the liquid - solid particles flow in the vertical pipelineRobert Hanus, Marcin Zych, Leszek Petryka, Volodymyr Mosorov and Paweł HanusEPJ Web of Conferences, 92 (2015) 02020DOI: https://doi.org/10.1051/epjconf/20159202020