Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditionsElena Lazareva, Sergey Zhmodik, Nikolay Dobretsov, Alexander Tolstov, Nikolay Karmanov, Andrey Dar’in and Ivan KirichenkoE3S Web Conf., 98 (2019) 05011DOI: https://doi.org/10.1051/e3sconf/20199805011