Isotopic-geochemical signs of the transformation of coal and bitumen during the ore mineralization of different types: Communication 2. Geochemical regularities in the distribution of rare earth and trace elements supplemented with the model of structural transformation of coal and bitumen during ore genesisE. D. Syngaevskii; Yu. V. Shchegol’kov; G. Ch. Vichtozhents; G. K. Khachatryan; S. N. Petrova · 2007